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One of the things I have noticed scouring the internet for tips on battery life prolongation, is that you end up with lots of contradictory advice coming from unreferenced (and often, unresearched) sources. (Note that by 'prolonging', I mean both prolonging the current battery cycle, and also, how to prolong the battery in the long term).
One big question is how you should be recharging it. For example:
Do you let the battery go down low, and then recharge it back to full?
Do you only do partial discharges, and always keep the battery topped up?
When available, is it better to work plugged in?
There are two helpful articles, both from the Battery University, which seems reliable and they have nice experimental data.
[1] Charging lithium batteries
[2] How to prolong lithium batteries
From what I gather, the answer to the above questions are as follows:
Full discharges will reduce the number of recharge cycles in your battery. For example, going to 100% discharge only gives a battery with 500 discharges, while going to 10% discharge gives a battery with 4700 discharges. Note that this advice contradicts other 'unreferenced' sources, like here:
Change your charging pattern: Most of us have the habit of charging the phone quite often even when the phone has enough battery left on it. It’s always better to leave the battery to discharge completely to say like 20% and only then recharge it. This way your battery will not only also last longer but also has longer life.
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It is better to note recharge to full
Li-ion does not need to be fully charged, as is the case with lead acid, nor is it desirable to do so. In fact, it is better not to fully charge, because high voltages stresses the battery. Choosing a lower voltage threshold, or eliminating the saturation charge altogether, prolongs battery life but this reduces the runtime. Since the consumer market promotes maximum runtime, these chargers go for maximum capacity rather than extended service life.
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However, I admit that this is a fairly PITA rule to implement. It would be impractical to always charge only to, say 80%. I think this rule, in practice, advises against charging all the way to 100% because then your charger may put in the topping charge (how many chargers do this?)
It is better to not leave devices plugged into wall charges.
Some portable devices sit in a charge cradle in the on position. The current drawn through the device is called the parasitic load and can distort the charge cycle. Battery manufacturers advise against parasitic load because it induces mini-cycles. The battery is continuously being discharged to 4.20V/cell and then charged by the device. The stress level on the battery is especially high because the cycles occur at the 4.20V/cell threshold.
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A portable device must be turned off during charge.
This allows the battery to reach the set threshold voltage unhindered, and enables terminating charge on low current. A parasitic load confuses the charger by depressing the battery voltage and preventing the current in the saturation stage to drop low. A battery may be fully charged, but the prevailing conditions prompt a continued charge. This causes undue battery stress and compromises safety.
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This, however, spawns two further questions:
What about USB charging? Because USB charging is slower (due to a lower amperage), is there any advantage to working with your tablet plugged into a USB drive? Is this better than discharging the battery?
I work with my laptop plugged in all the time. Partly, there is nothing I can do about it (Macbooks no longer allow easy removable of the battery). This means that on top of the heat degrading the battery, one must contend with the battery contunually being charged. What are the safeguards in place? I would imagine a smart charging system would lower the voltage and amperage when a laptop is plugged in.
I remember when I used a iPhone that one cycle includes partial charges and discharges like if you charge 10% and then another 20% and so on you ad those until you get 100% of a cycle, this was according to apple. That's why you can get your battery dead in one year and half (since they promises 450ish battery cycles )
Inntresting reading...
Sent from HTC Sensation, Elegancia ROM Series....
Hey, thanks for this, man. Good tips. I don't want to go abusing the batteries of all those shiny new Christmas gadgets.
Thanks very useful tips
Yes for li-ion you never want it to fully discharge.
Rift
I like the research you did here very nice. I have an EVO and that thing can't hold a charge for anything. I have like three batteries (two that come with wall chargers) just so I know I'm not going to run out of juice when I need it. I could leave everything off like mobile data, wifi, etc but then why do I have a fancy smancy phone then to begin with I want to use the damn thing. The battery is my only real issue I have with this magnificent phone. Thanks for taking the time to do some research on the subject.
Thanks for the tips. Battery is important than CPU now as for UX is concerned.
battery management
i found the battery manager from Market Place really useful for my I9000 Galaxy S on ICS
thanks for the good information
Thanks for this news
If your worried about power "cleanliness" you could always get a power conditioner to guarantee level output.
Now with batteries being able to be replaced easy enough (droid user) and with in my price point I don't give it too much thought.
Thanks for the great info, should be a big help
Glad I have insurance.... battery dies, they give me a new one!-
3G or 2G
Had someone checked, if using 2G instead of 3G giving the much better battery life?
If you are asking if you get more battery life with 2G than 3G, I think it's the same. The battery life should be less if you have the option "use 2G/3G preferred" because the phone searches simultaneously for 2G and 3G frequencies
Now that you bring that up, has anybody compared 3g to 4G battery life?
Thanks for the tips. It really does get confusing when coming to batteries.
Thank you for the advice
i agree...and have found this all true in my own studys and doings
As we all know, batteries, overtime tend to lose their capacity to hold charge, due to loss of free ions. Something, which we, the smartphone users are constantly worried about. I mean,nobody would like to let degrade a factory provided product.
So here, I am presenting a thorough analysis, which might help to slow down their deterioration.
Readers note, that the processes analysed below , are evidential for both the type of batteries, powering the current generation smartphones i.e LI-PO/LI-ION
INTRODUCTION-
Just as with other lithium-ion cells, LiPos work on the principle of intercalation and de-intercalation of lithium ions from a positive electrode material and a negative electrode material, with the liquid electrolyte providing a conductive medium. Thus,the more frequent are the charging times, more will be the ionic flow, further improving the withstanding capability of the electrolyte. Li-Ion and Li-Polymer batteries, if charged often, after about 1 month, would reach to their maximum performance, and by performance, I mean, the maximum capacity of charge it can hold. This doesn't have any noticeable effect on the battery life and so you are recommended to charge them every time you find an outlet.
EFFECTS OF COMPLETE/PARTIAL CHARGING -
Complete and partial charging, has their positive effects on battery's performance and life respectively, whilst harmful, vice-versa. Personal preference, here.
[COMPLETE]Improving the battery performance
For this section, performance should be prior to life cycle. This can be attained by allowing the battery to charge to their maximum potential permitted by its voltage rating. Adding full saturation of the permissible voltage boosts the capacity by about 10 percent but adds stress due to high voltage gradually affecting the battery life in the process.
OR
[PARTIAL]Maintaining the battery life.
For this section, life of the battery is everything for the user. The small boost may not feel significant, when you are sacrificing its lasting time. So they need not be fully charged, as is the case with lead acid, nor are desirable to do so. In fact, it is better not to fully charge, because a high voltage stresses the battery, as evident from above case. Choosing a lower voltage output, or limiting the saturation voltage altogether, effectively prolongs the battery life.
CHARGING WITH A HIGHER POWER OUTPUT
This misconception is popular in today's power users, charging with a output of a greater ampere rating, speeds up the charging. Yes, of course it does but distorting the final phase of charging in the process. Increasing the charge current does hasten or appears to hasten the charging process. But, though the battery reaches the voltage peak quicker, the saturation charge will take longer accordingly. The amount of charge current applied alters the time required for each stage; Stage 1 will be shorter but the saturation Stage 2 will take longer. A high current charge will quickly fills the battery to about 70 percent which is the initial phase. And reaching the peak voltage quickly, yet again pressurize the battery,reducing its life. However, choosing a lower voltage output, or limiting the saturation voltage altogether, adds up to the battery life.
MYTHS
The first time charging and "wait-until-full-discharge-before-recharge" and "don't-use-when-charging" are not applicable to these modern batteries. Waiting for complete discharge of a li-ion or li-po battery, totally stops the ionic conduction. And which might take a while to reactivate for their next conduction. Charging from scratch is recommended..
OTHERS-
Also follow the instructions about the batery temperature range.
Avoid keeping battery completely discharged for long periods of time.
Hope the article helps you all, get the most of your battery.
techy97 said:
As we all know, batteries, overtime tend to lose their capacity to hold charge, due to loss of free ions. Something, which we, the smartphone users are constantly worried about. I mean,nobody would like to let degrade a factory provided product.
So here, I am presenting a thorough analysis, which might help to slow down their deterioration.
Readers note, that the processes analysed below , are evidential for both the type of batteries, powering the current generation smartphones i.e LI-PO/LI-ION
INTRODUCTION-
Just as with other lithium-ion cells, LiPos work on the principle of intercalation and de-intercalation of lithium ions from a positive electrode material and a negative electrode material, with the liquid electrolyte providing a conductive medium. Thus,the more frequent are the charging times, more will be the ionic flow, further improving the withstanding capability of the electrolyte. Li-Ion and Li-Polymer batteries, if charged often, after about 1 month, would reach to their maximum performance, and by performance, I mean, the maximum capacity of charge it can hold. This doesn't have any noticeable effect on the battery life and so you are recommended to charge them every time you find an outlet.
EFFECTS OF COMPLETE/PARTIAL CHARGING -
Now this is a personal choice. You can choose either to-
1)Improve the performance of the battery (or)
For this section, performance should be prior to life cycle. This can be attained by allowing the battery to charge to their maximum potential permitted by its voltage rating. Adding full saturation of the permissible voltage boosts the capacity by about 10 percent but adds stress due to high voltage gradually affecting the battery life in the process.
2)Maintain the battery life.
For this section, life of the battery is everything for the user. The small boost may not feel significant, when you are sacrificing its lasting time. So they need not be fully charged, as is the case with lead acid, nor are desirable to do so. In fact, it is better not to fully charge, because a high voltage stresses the battery, as evident from above case. Choosing a lower voltage output, or limiting the saturation voltage altogether, effectively prolongs the battery life.
CHARGING WITH A HIGHER POWER OUTPUT
This misconception is popular in today's power users, charging with a output of a greater ampere rating, speeds up the charging. Yes, of course it does but distorting the final phase of charging in the process. Increasing the charge current does hasten or appears to hasten the charging process. But, though the battery reaches the voltage peak quicker, the saturation charge will take longer accordingly. The amount of charge current applied alters the time required for each stage; Stage 1 will be shorter but the saturation Stage 2 will take longer. A high current charge will quickly fills the battery to about 70 percent which is the initial phase. And reaching the peak voltage quickly, yet again pressurize the battery,reducing its life. However, choosing a lower voltage output, or limiting the saturation voltage altogether, adds up to the battery life.
MYTHS
The first time charging and "wait-until-full-discharge-before-recharge" and "don't-use-when-charging" are not applicable to these modern batteries. Waiting for complete discharge of a li-ion or li-po battery, totally stops the ionic conduction. And which might take a while to reactivate for their next conduction. Charging from scratch is recommended.
OTHERS-
Also follow the instructions about the batery temperature range.
Avoid keeping battery completely discharged for long periods of time.
Hope the article helps you all, get the most of your battery.
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Great Guidance Sir! It's Little bit scientific but over all good job!
Suggestion:-
Add More Things To the post like why we should not use power saver apps, cache cleaners! How can we save juice of our device without using any app. Etc.
HIT THANKS IF I HELPED YOU SOMEHOW!!
dark_optimistic said:
Great Guidance Sir! It's Little bit scientific but over all good job!
Suggestion:-
Add More Things To the post like why we should not use power saver apps, cache cleaners! How can we save juice of our device without using any app. Etc.
HIT THANKS IF I HELPED YOU SOMEHOW!!
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That is a great suggestion, but based on my personal experience, the apps promising better battery life and others similar ones,were found to have no such noticeable effect,on either the battery's life or its performance,other than ram-eating hogs., which in turn actually, eats up the battery. I definitely wouldn't recommend any of those apps, for battery saving purposes, and neither do I use any of them.
techy97 said:
That is a great suggestion, but based on my personal experience, the apps promising better battery life and others similar ones,were found to have no such noticeable effect,on either the battery's life or its performance,other than ram-eating hogs., which in turn actually, eats up the battery. I definitely wouldn't recommend any of those apps, for battery saving purposes, and neither do I use any of them.
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Yap!
Executive Summary: Quick Charge, e.g. Qualcom Quickcharge 3.0 can be considered a very smart manufacturers' measure for built-in obsolescence and revenue maximization for the usage behavior of most smartphone users.
Preamble:
If you are used to buy one smartphone per year and this is nothing you worry about or consider wasteful or have a bad conscience about for environmental and/or child labor and/or wallet reasons, you can just ignore this topic, as it is not written for you. If you think that a smartphone should easily live like 5 years or more, as there is actually neither a software nor a hardware reason nor a style reason that ought to prohibit this - you might be interested in reading further.
How charging works and what Quick Charge does:
If I get it right, fast charge or ultra fast charge technologies, such as Qualcom Quickcharge 3.0, only use a higher charger voltage to increase the transfered power through the usb cable(!), while meeting the safety specs of all existing usb cables (and long-ago existing standards) that don't support currents of more than approximatly 2A (due to the small cable cross section and therefore high cable losses / heat / fire hazard danger). Transfering power at a higher voltage at the same current will generate the exact same losses (heat) but transfer more energy, as power is voltage times current. If I understand it correctly, the CC/CV-Charge-Cycle (CC = constant current; CV = constant voltage), which is common/standard for all lithium batteries, actually only supports charge voltages - directly at the battery input - of somewhat in between 3V and 4.3V (depending on the charge capacity state). It is actually not possible to directly supply the battery with a voltage higher than 4.3V (e.g. 20V, like a charger with Qualcom Quick Charge 3.0 could supply(!)) and using a reduced current instead (and therefore a reduced heat generation in the battery), because the current would just increase to very very very high values and the charging process might become highly instable and dangerous if such a high voltage was supplied directly to the battery.
This means basically:
Each smartphone must contain a step down converter (DC/DC-converter) that converts the charger voltage of something like 5V, 9V, 12V, or even 20V to a value between 3V and 4V during the CC-charge phase, while "converting the voltage difference" to a higher current, e.g. to 3A. The current generates the losses (heat) due to the (unfortunately existing) internal resistance of the battery (which is increasing as heat increases, increasing losses, increasing heat, increasing resistance, - a so called thermal walk-off, that's why the temperature is often measured during charging process - a vicious cycle). I just checked it for a Moto G5 Plus in Turbo Charge Mode: The USB power meter showed 9V and 1.45A (9*1.45=13W charge power at the output of the charger), being reduced to a value of about 3.9V on the internal lithium voltage input for the battery and a value of 2.8A for the charge current of the battery (according to the app "Ampere", which reads those values from the android system)!
Side note: This is a factual charge power of only 11W and the difference of 2W must be losses in the cable and of course the step down converter, which generate additional (unwanted) heat (or it must be a measurement error, which would be a little high for a measurement uncertainty, I think.).
For a 2800 mAh battery (2.8 Ah) it means that the battery is charged at "1C" (meaning that the capacity of 2.8Ah would be theoretically reached within 1 hour, if charging the phone with a constant current of 2.8A and a fully discharged phone at beginning of charging process). Unfortunately, it also means that a lot of heat is generated while charging and that the lifetime of the battery might be reduced dramatically - the hotter the battery gets - not as dramatic as for a "2C" or even "3C" charge, but a lot more dramatic than for a 0,33C charge, which would be only 0.9A for an 2.8Ah battery capacity. Lithium Battery life or aging, which basically means a deacrease of the original capacity, is extremly depending on
heat generation while charging (if you could keep your battery temperature regulated to like 15 degree Celsius by a cooling system as in car battery systems: it would be not damaged, even if charging at very high currents, as long as you are able to keep the temperature stable at 15 degrees Celsius. The heat is the factual problem, not the current itself.)
charge state (at how many percent of the battery's full capacity you store your battery... something between 50 and 70 percent is a lot more life preserving than 100 percent or 20 percent!)
But, guess what?:
There is neither an option for a battery life preserving charge state (e.g. keeping your battery on 60 percent) nor for a software limit of the charge current, e.g. by a simple app, because all of the charge features are extremly hidden and protected by the system. Even root does not provide control over it. I am not sure on this aspect and I am looking for an app that might let you limit charging current and let you redefine the fully-charged state, start of charge percentage, stop of charge percentage, etc. - so please feel free to correct me if I am wrong!. (unfortunately, I am probably not wrong...).
I can tell you one thing: Companies, such as Tesla, only use a very small range of their lithium batteries potential, as do all car manufacturers, as they could never ever provide a 10 year life time cycle for their battery technology if they'd use the same range as smartphones do (0-100 percent as reference). For a car manufacturer 0 percent means something like a factual charge state of 50 percent (speaking in smartphone terms) and 100 percent means something like a factual charge state of 80 percent (speaking in smartphone terms) - as they know that this will increase their battery life extremly. So they could actually make cars drive more than 2000 km (1243 miles) with one single charge, but they know that this would mean a bricket battery after one or two years, at maximum. Please don't pin me down on the exact numbers, but you should understand the concept. The second thing is cooling. Their batteries are charged in a way that you could not burn your fingers on when touching the battery, like it almost can happen on your smartphone, when turbo charge is running for like 20 minutes (my G5 Plus gets really hot, although "only" charging with "1C" - not even more).
Useful hint: If you use a magnetic car holder on one of your car's ventilation grids and use your airconditioning at a cold temperature in summer - you can save your smartphone's batteries life, especially when generating a lot of heat due to draining a lot of current (due to GPS navigation and display brightness at bright daylight) and parallel recharging with high current or similar... . But take care: In winter, when additionally blowing heat on your phone, the battery will die very early and you should fully close the ventilation grid, where the smartphone is placed.
The thing that makes me angry is not having control over it - for me personally - I would be perfectly ok with a charge state of 50 to 60 percent and an algorithm that only charges if the state drops below 50 percent and stops as soon as it reaches 60 percent. Also, I want a slow charge rate (e.g. 0.33C), which is only overruled if I want so - by hitting a button. Typically I go to work, I plug my smartphone to some charger. I come home, I plug my smartphone to a charger. I sit in the car, I plug my smartphone to a charger. I go to bed, I plug my phone to a charger. I am abroad, I plug my smartphone to my abroad charger in some hotel. Ocasionally - like five to ten times a year, I know (typically before) that I will need a full charge of a 100 percent as I will be out of charging possibilities for several hours and I will be needing something like GPS etc. In these rare cases I could easily switch the charge protection off by the hit of a button and the smartephone would be (maybe even quickly - if I whish so) charged to 100 percent. But it is just very stupid to take your almost discharged smartphone with a charge state of 20 percent, go to bed, plug it to a quick charger, let it charge to 100 percent within one or two hours, although you sleep like 6 to 8 hours. It is a total waste of battery life and there is abosolutely no reason for it. But why does none of the manufacturers give you control about charging? Do you get the message? They profit. They profit from early bricket batteries, as it is the most common reason for users to overcome their old phone for the sake of a new one - mostly accompanied with a lie to themselves like "Changing my old (built-in) battery would cost alnmost as much as a new smartphone and then the smartphone would still be over a year old, which is really old - so I am just going to buy a new one. Besides, hitting one-click on amazon is a lot less trouble than having to find the right battery and someone to replace it. I will better dump my old smartphone." (and generate enormous amounts of electronic waste that mostly gets illegally dumped somewhere in Africa, where children try to burn the phones and get one or two grams of precious metal out of it, while breathing toxic gases).
Why would Smartphone manufacturers or Smartphone CPU-manufacturers, such as Qualcom, want that?
Another - probably true - story, or call it conspiracy theory: I can really really imagine as some business guys from some smartphone company where sitting together with their techies. The techies told the business guys: "We can unfortunately not charge at higher currents, making the batteries die more early, because the usb standard forbids it and existing cables might catch fire. It would be too risky. All other planned obsolescence measures would be highly illegal - you know what happend to Volkswagen or Apple, do you?". [You could also imagine the guys from Qualcom asking: "How could we make Smartphone manfacturers sell more Smartphones and us supplying more CPUs...?"] The business guys groaning in a desperate mood: "What can we do to make them buy ... more smartphones ... more often ... we must... find... something" - until one techie suddenly came up with the idea "we could increase the voltage to break those stupid existing usb standards as we only have to keep the current as low as 2 amperes to prevent the cables from burning!". "Then we could transfer a lot more energy to the smartphone, where we use our built-in heat generators to make the batteries get very hot during charging, making them die very early, making customers have to buy more phones, more often! And it doesen't matter how we generate heat, all losses will generate heat. No matter, if in the battery or in the step down converter - that's awesome!". That techie got a reward of 5.000$ and some clammy handshakes for his idea, while the business guys live in the Caribbean now, in their palaces. And the worst thing about it is: Everyone is happy, including the majority of uninformed customers that think they were blessed with this terrific new Quick Charge feature. That's what I call a really really smart measure of built-in obsolescence! Just waiting for the first manufacturers to offer 2C- or 3C-charging - it will come soon - and customers will be beaming with joy, while watching their battery charge state increase percent by percent each ten seconds.
To put it in a nutshell you could basically consider the quick charging feature just as a planned obsolescence measure to make customers buy new smartphons even more often(!) than they already do, as their (nowadays, of course) built-in battery will die a lot earlier and cost a lot of money to be replaced by an original one, making the decision to buy a new phone look more convenient. The primary manufacturer interest is making you buy more smartphones, more often and increase their - anyway enormous - revenues. Other manufacturers' techies (of course) realize that quick charging technology will basically age batteries 20 percent earlier - but even if they wanted therefore not to adapt the quick charge concept, they would lose customers, as the average customer is unfortunately not very smart or technophile and will only be able to draw relativly stupid conclusions, such as: faster charging = better smartphone; slower charging = inferior smartphone. "Must buy faster charging smartphone!"
Other thoughts:
No, no, definitely no - it is not an considerable option to control the charge process manually and keep the charge state within the range of 50 to 60 percent manually. It is also not an option to have to buy multiple chargers and keep one quick charger and one oldschool charger at every place you want to have a charger, just to make sure that you can use quick or slow charge, when you need it. This is totally inacceptable as it could be solved by software easily!
At least my G5 Plus seems "only" to charge at 1C, which is a lot less worse than 2C or 3C charging. Still, 0.33C charging or less - especially in combination with keeping your battery between 50 and 60 percent of capacity most of the time - would probably increase battery lifetime in a way that the battery could remain in the almost exact same state as a brand new battery, even after a period of five years. At least if you'd also take care about not overheating your phone's battery (e.g. leaving your phone in the car in summer or leaving it in direct sunlight, while lying at the beach for hours!). Another battery killer is of course discharging by drawing massive amounts of energy, e.g. GPSnav+Teethering+BrightestDisplaySetting+PlasticCoverThatKeepsHeatInTheBattery at the same time. Probably, this could be even more battery life killing as 1C charging.
As it is not the current itself that ages the battery but the heat it creates - one should consider things like removing your plastic protective case, which is typically a thermal insulator and will keep a lot more heat in the battery during charging, avoiding heat conductive cooling. Probably the best thing would be to blow cold air on your phone, especially while high speed charging (e.g. magnetic car holder at the ventilation grid in combination with air con in the car.) or at least placeing your phone - without cover - on some thermally highly conductive material, e.g. a metal plate (like on a stainless steel pot base...). This will suck the heat from the battery very quickly and therefore do less harm to the lithium chemistry. I can imagine that some companies might eventually offer charger combinations that do something like 3C-charging, while your smartphone is being cooled by some Peltier-elements, with an incredible charge speed for a full charge of something like 20 minutes, without harming your battery too much. But it is a niche with regard to the fast moving smartphone market.
What do you guys think?
PS: The topic might be better in Android General - but I am not sure... I would be very interested in an app, as explained in the text. But it is actually a more general topic.
Hello everyone
I installed a few apps to monitor battery performance because I noticed battery life changing, and noticed that the voltage output changed during the day. I started monitoring the voltage when the battery was about %35 till it reached %10. Voltage read by apps was about 3.7. But after recharging the phone and unplugging it, voltage was between 3.88v - 4.14v.
I'm now at %88 so idk if it will drop further or not, but generally speaking, is it normal (and healthy) for output voltage to exceed 3.8?
Thanks in advance
Android LG phone running 5.0.1. phone operating normally as far as I know. Tested different apps same readings
Aserar said:
Hello everyone
I installed a few apps to monitor battery performance because I noticed battery life changing, and noticed that the voltage output changed during the day. I started monitoring the voltage when the battery was about %35 till it reached %10. Voltage read by apps was about 3.7. But after recharging the phone and unplugging it, voltage was between 3.88v - 4.14v.
I'm now at %88 so idk if it will drop further or not, but generally speaking, is it normal (and healthy) for output voltage to exceed 3.8?
Thanks in advance
Android LG phone running 5.0.1. phone operating normally as far as I know. Tested different apps same readings
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It depends on change voltage output on your battery for example when i am 26% at 3.3v when it's charging and to the 100% my voltage peek down 2.5v and will stop flowing my battery to prevent to overcharge that's why our phones can leave overnight because lithium battery are hi-tech and can stop a flowing.
unlike nickel battery or alkaline battery is doesn't record the data, doesn't have board inside for protection circuit, lithium battery can so.
calibrate your battery.
don't trust any monitor app will false your information if you are rooted then you can see all information about your battery.
And what your lg model.
Sent from my Pixel 2 XL using Tapatalk
First of all, i have removed the battery from the tablet and i am supplying energy from the battery terminals (in this case, i want to be able to use my charging socket for the “OTG function”)
Even though giving the constant 4.2 volt electricity with this technic, battery gauge still drains from the tablet
im using chinese branded device as tablet by the way.Device is rooted with Android 10 go edition in it.
Normally, it has 2000mAh battery and the draining speed/principle is same as the above scenario
i’m waiting for the solution ideas or any suggestions
What exactly are you trying to accomplish?
Lithium ion batteries should NEVER be directly charged with a power source. Tablets and phones have charging controllers that regulate the charging current and voltage to avoid overcharging the battery, which at best reduces battery life, and at worst can cause catastrophic failure - including explosion and fire.
V0latyle said:
What exactly are you trying to accomplish?
Lithium ion batteries should NEVER be directly charged with a power source. Tablets and phones have charging controllers that regulate the charging current and voltage to avoid overcharging the battery, which at best reduces battery life, and at worst can cause catastrophic failure - including explosion and fire.
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First of all, thank you for thinking of me. I am an experienced electronic engineer and have knowledge of Li-ion batteries. For the project that I am working on, I have to not use batteries due to the variation in ambient temperature.
Since I know that a fully charged battery provides 4.2 volts of energy, i remove the battery and so, supply this voltage from the place where the battery should normally be inserted.
When I turn on the tablet, the battery percentage shows 100%, after 20 minutes it drops to 85% approximately.
I don’t give the direct energy to the battery btw, on the contrary, i’m giving the energy from another source that the battery should normally give.
The attached photo can help you to have an idea for the situation
I just need to prevent the system for lowering the battery level as if like there is still battery in the tablet
brkedmrts said:
First of all, thank you for thinking of me. I am an experienced electronic engineer and have knowledge of Li-ion batteries. For the project that I am working on, I have to not use batteries due to the variation in ambient temperature.
Since I know that a fully charged battery provides 4.2 volts of energy, i remove the battery and so, supply this voltage from the place where the battery should normally be inserted.
When I turn on the tablet, the battery percentage shows 100%, after 20 minutes it drops to 85% approximately.
I don’t give the direct energy to the battery btw, on the contrary, i’m giving the energy from another source that the battery should normally give.
The attached photo can help you to have an idea for the situation
I just need to prevent the system for lowering the battery level as if like there is still battery in the tablet
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Click to collapse
Oh okay, I suspected that's what you were doing, I was just trying to make sure in the interest of safety and all that. It's all fun and games until someone gets hurt...
It's really hard to say why the battery gauge reports 85% even though you're supplying 4.2 volts of power. Depending on the firmware, Android battery gauges aren't simple voltmeters that simply display a percentage based on a certain voltage curve. They're a bit more advanced than that, and factor in the load on the battery too.
Here is a better explanation on how the systems work.
I would like to add another question that makes me wonder, will the battery percentage stay constant somewhere and/or will it start to rise after some point?
If there is no way to prevent the battery from decreasing in terms of software, I don't want the screen to go black when it reaches 15% and turn off at 0%. I'm going to make a supercapacitor and a modification to charge.
Or if I arrange the android as if there is a battery near infinity, I think that I can almost stop the battery percentage decrease rate, is that logic possible?
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brkedmrts said:
I would like to add another question that makes me wonder, will the battery percentage stay constant somewhere and/or will it start to rise after some point?
Click to expand...
Click to collapse
I honestly don't know.
brkedmrts said:
If there is no way to prevent the battery from decreasing in terms of software, I don't want the screen to go black when it reaches 15% and turn off at 0%. I'm going to make a supercapacitor and a modification to charge.
Or if I arrange the android as if there is a battery near infinity, I think that I can almost stop the battery percentage decrease rate, is that logic possible?
Click to expand...
Click to collapse
If you're powering the device via a constant DC supply that doesn't drop voltage under load, I would imagine the battery indicator would eventually stop at some point and just remain at a certain percentage. Again, this depends on what sort of controller the device has; if it's an adaptive learning battery management system, it might be ignoring the supply voltage, and is calculating how much power the device has used so far. Eventually it'll figure out that the voltage isn't dropping as expected, but I have absolutely no idea what it'll do.
I'd say just leave it playing video or something for a while and see what happens.
V0latyle said:
I honestly don't know.
If you're powering the device via a constant DC supply that doesn't drop voltage under load, I would imagine the battery indicator would eventually stop at some point and just remain at a certain percentage. Again, this depends on what sort of controller the device has; if it's an adaptive learning battery management system, it might be ignoring the supply voltage, and is calculating how much power the device has used so far. Eventually it'll figure out that the voltage isn't dropping as expected, but I have absolutely no idea what it'll do.
I'd say just leave it playing video or something for a while and see what happens.
Click to expand...
Click to collapse
I had decided to try my super capacitor idea. However, For a device whose charge level drops while charging with its original battery installed, this was not very wise.
but I added a capacitor as shown in the attached image and I've been testing it for 25 minutes.
battery percentage 99% for last 20 minutes.I t hope I managed to manipulate it somehow.
I will be sharing the results,Also, thank you for your interest.
brkedmrts said:
I had decided to try my super capacitor idea. However, For a device whose charge level drops while charging with its original battery installed, this was not very wise.
but I added a capacitor as shown in the attached image and I've been testing it for 25 minutes.
battery percentage 99% for last 20 minutes.I t hope I managed to manipulate it somehow.
I will be sharing the results,Also, thank you for your interest.
Click to expand...
Click to collapse
Hey there, were you able to work it out?