Related
http://www.batteryuniversity.com/parttwo-34.htm
good read as it seems many still maltreat their li-ion
acording to old ni-cam myths
Also, make sure you read http://wiki.xda-developers.com/inde... revolutionary, comparative, numeric results!
I've always said this simple statement about LiIon: Charge early and often.
Do you need to plug the phone in every time you get off a call? No. Do you need to worry about it dropping below 80%? No. Just charge as often as is convenient. Sitting at a desk for a hour working on something? Charge. Driving for more than 15m? Charge.
I think if you obsess too much you might wind up with USB connector problems from all the cycles on the connector itself, but intelligent use of the above statement should get you the most out of your battery.
EDIT: Drat, replied to the wrong topic.
khaytsus said:
I've always said this simple statement about LiIon: Charge early and often.
Do you need to plug the phone in every time you get off a call? No. Do you need to worry about it dropping below 80%? No. Just charge as often as is convenient. Sitting at a desk for a hour working on something? Charge. Driving for more than 15m? Charge.
I think if you obsess too much you might wind up with USB connector problems from all the cycles on the connector itself, but intelligent use of the above statement should get you the most out of your battery.
EDIT: Drat, replied to the wrong topic.
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Click to collapse
that would kill the battery life fast, yea u wont run out of battery soon but keep it up and ur battery is gonna die on u after talking for 1hr
Aznskill2k said:
that would kill the battery life fast, yea u wont run out of battery soon but keep it up and ur battery is gonna die on u after talking for 1hr
Click to expand...
Click to collapse
er.......what?
i believe that you have to charge your battery all the way full then use all the power until it dies then you can charge it back again
but not sure
kevinutz said:
i believe that you have to charge your battery all the way full then use all the power until it dies then you can charge it back again
but not sure
Click to expand...
Click to collapse
This is the exact opposite of what this article says.
Sent from my custom ROM'd Captivate
conditioning the battery the first time you get a new phone also helps, alot of us just charge for a while them use it. all my phones i let them charge for a full 24 hours right after i get them
My battery only last 6 hours
Ugh, why don't people read the article BEFORE they comment?
newarkhiphop said:
conditioning the battery the first time you get a new phone also helps, alot of us just charge for a while them use it. all my phones i let them charge for a full 24 hours right after i get them
Click to expand...
Click to collapse
Ehh, doesn't the charger uncharge when the battery is full? Like a safety thing?
Sent from my Desire HD using XDA Premium App
Some articles say that one battery life cycle is used up everytime when a full charge is done. Other articles say that one battery life cycle is used each the battery is connected to the charger.
I have not seen one article that shows the truth with facts.
Sent from my GT-I5800 using XDA App
kevinutz said:
i believe that you have to charge your battery all the way full then use all the power until it dies then you can charge it back again
but not sure
Click to expand...
Click to collapse
No offence but I always found this to be stupid reasoning.
What if you leave home with a quarter full battery and you get caught in the middle of a natural disaster (earthquake as an extreme example) and need to keep in contact with rescuers after being stuck in a building for 2 days?
Personally, I always charge my phone/laptop whenever convenient.
black50z said:
My battery only last 6 hours
Click to expand...
Click to collapse
The only problem that your battery lasts only for 6 hours is due to too much charging...So when you will buy a new battery then make sure that only charge your battery when it will remain only 10%...And try to charge your battery with phone switched off..
Charge little and often, try to avoid deep discharge/charge cycles.
Back in the days of NiCd batteries there was the posibility of memory effect where if you didn't do a discharge/charge the battery wouldn't hold as much charge.
NiMH batteries do not suffer this, but discharge/charge cycles were required because when they started being used very few people had smart chargers so had to discharge to be able to time when to stop without overcharging, and also due to confused information pulled over from NiCds.
Top up charges are better for them too.
Lithium batteries also don't have memory effect, and are better off with top up charges.
Ask yourself this:
What would stress the battery more; running 1A through it for 10 minutes or 1 hour?
Also, as the battery discharges, its voltage drops so the current drain has to increase to compensate, discharging the battery even quicker (remember how capacity graphs drop off quickly?)
Say your phone needs 2W to run, with a 4v battery that's a drain of 500mA (P=VI)
When the battery has dropped to 3.5v then to produce 2W it takes approx 571mA.
batt problem
how to keep my batt good?
I've always just charged my phones overnight while I sleep. Never seen ill effects. If I don't make it home that night my phone still lasts through the next day.
It's not like that battery is irreplaceable. Go get a new one if your battery is nearing the end of it's life. By then you would have probably moved on to a new phone.
Rudegar said:
http://www.batteryuniversity.com/parttwo-34.htm
good read as it seems many still maltreat their li-ion
acording to old ni-cam myths
Click to expand...
Click to collapse
skimmed a few parts, but thanks for the read mate, learned tons.
as others allready mentioned, there are many different suggestions how to take care of the battery. I usualy reload the baterry only if the capacity is <= 5%, without unpluging it before it reaches 100%.
thanks for the info!
I go out at night mostly so by the time i leave the house my phones battery is about 75% full. I have the LG G2x. My question is sometimes before i leave i'll see that it's 75% full so i'll charge it back to 100% before i leave. Does charging the phone without it being drained damage the battery? should i just leave it alone next time i go out? sorry if this is already a thread just point me in the right direction.
Thanks.
You're not damaging your battery But if you never drain the battery completely, i'm not sure how good the battery will be after 6 month, so i recommend you drain it completely every couple of weeks.
Sent from my HTC Desire HD using XDA Premium App
There are several opinions about keeping battery health for more time. Recharging at 75% is not one of them, but it's not the worth of it.
Here's what i know and what i've heard:
* some manufacturers (laptops) have software that don't allow the battery to charge when it's over 80 to 90% - they say it helps on battery life
* it's common sense that you should recharge when you have 20 - 40% and do a full cycle once in a while (this is what i do)
In my opinion, charging only 25% of the charge in a regular basis will not really help to keep battery life...
I've personally had the best performance from batteries when I let them discharge as much as possible and then charge them to full without interruption.
some have also said that draining the battery too often can also damage it, is this correct?
They like to be ran down then recharged but not all the way down to nothing unless you are having a problem with bat life on a rom
groe886 said:
some have also said that draining the battery too often can also damage it, is this correct?
Click to expand...
Click to collapse
Yes. You should not drain your battery all the time. Use normally, charge it when below 40% and yes, charge it back to full - that's the ideal thing.
l4g4rt0 said:
Yes. You should not drain your battery all the time. Use normally, charge it when below 40% and yes, charge it back to full - that's the ideal thing.
Click to expand...
Click to collapse
+1 that is the best way. Li-on batteries should'n be drained completly because it can shorten their life.
I read somewhere that it is not important when you start charging your battery (20%, 60%...) but it's important that it finishes to charge up to 100% every time
I heard/read that LI-ION batter is good to charge when cap goes bellow 30%.
Hello everyone
I was wondering if its ok to leave the transformer connected to the charger.
Is it like the Evo with trickle down when it reaches 100%
I dont want to over charge it. If it were my laptop i would disconnect the battery at full charge. But its not possible to do that with the transformer.
I want to keep my cycle count low and prevent over charing.
I also wonder what happens in a few years when the battery is shot...
Charging is what damages Li-Ion batteries... I'd recommend not keeping it on the charger all the time. Android will purposely not keep the battery at 100% to help avoid some damage.
Li-ion prefer to be around 20-80% charge.
When battery is 100% and you keep the charger connected, heat will begin to build up and eventually you will kill your battery.
I'd do as with a notebook: charge till 100%, then remove battery or charger (in case of the tablet charger ) . Then use your tablet and recharge when needed / desired. And from time to time a full charge / discharge cycle won't do any harm.
Just my 2 cents.
Regards.
These tablets don't automatically recognize when it's fully charged and turn off the charging?
Ravynmagi said:
These tablets don't automatically recognize when it's fully charged and turn off the charging?
Click to expand...
Click to collapse
They do. There are other threads asking why thier TF's don't show 100% when unplgged from the charger. Same as it does on my Evo.
I think pretty much every modern device recognizes a full charge and responds accordingly. In fact, MacBooks will throttle performance if the battery ISN'T kept in while the system is running on A/C.
Heat will damage a battery, but it's not heat from charging but heat from operation. If a notebook is poorly designed and the battery is near a heat source, then removing the battery might be a good idea (except with the aforementioned MacBooks), but that's independent of the charging issue.
I think it's fine to keep it plugged in. These devices are smart enough to manage such things. Of course, the TF's charging cable's so short it's hard to use when plugged in, but that's a different issue entirely.
CalvinH said:
When battery is 100% and you keep the charger connected, heat will begin to build up and eventually you will kill your battery.
I'd do as with a notebook: charge till 100%, then remove battery or charger (in case of the tablet charger ) . Then use your tablet and recharge when needed / desired. And from time to time a full charge / discharge cycle won't do any harm.
Just my 2 cents.
Regards.
Click to expand...
Click to collapse
From what I understand this process cannot and will not kill the battery. This did happen in the old type of batteries with the ,emory effect but these new batteries and the OS's management system for charging does not allow the battery to be killed.
it will heat up and that would happen as there is a flow of electricity but not to a level that would kill the battery.
Cheers
IS it normal to go from 4% battery to 99% in under 3 hours ?
I thought this was supposed to take 8 hours to charge.
Cheers,
gpearson1968
gpearson1968 said:
IS it normal to go from 4% battery to 99% in under 3 hours ?
I thought this was supposed to take 8 hours to charge.
Cheers,
gpearson1968
Click to expand...
Click to collapse
Yes that's normal. It's meant to take about 3hrs.
Thanks guys...
Still dont know about it. Because I think its like my EVO and technology got so good that my battery is protected.
I really dont want my transformer to become a expensive paper weight or non-mobile because after a few years it has 45 mins battery life.
I've got the first full charge and full depletion done. Is it ok to use while charging now as long as I fully charge and fully deplete it a couple more times?
error12 said:
Thanks guys...
Still dont know about it. Because I think its like my EVO and technology got so good that my battery is protected.
I really dont want my transformer to become a expensive paper weight or non-mobile because after a few years it has 45 mins battery life.
Click to expand...
Click to collapse
batteries will degrade over time....would you be keeping this tablet for over 2-3 years? a simple battery change could work if ever needed
I am no expert, but I have spent some time searching around the internet looking for information on the best methods for improving the life of a battery. Most of the information I have found said it is bad to completely discharge a Li-polymer battery. The articarles stated it was best to charge the battery when it reaches 20% to avoid shortening its life.
Sent from my DROIDX using XDA App
Batteries are like muscles - they like to be exercised.
Leaving the unit plugged in WILL NOT HURT YOUR BATTERY. Period. The charging circuitry in modern devices is smart enough to cut current to the battery once it has reached a certain level of resistance.
Batteries do not like being deeply discharged. Most devices will shut off before the battery gets too deeply discharged, but it's never a good idea to tempt fate by running it until the device shuts off.
What really determines a battery's life is the number of cycles it has been put through. A cycle would be a full charge followed by a full (or to a lower end threshold) discharge.
The old original Lithium Ion batteries used in laptops would usually last about 300 full cycles or so - about a year if you used it on the battery every day. Partial discharges of course only count as fractions of a cycle.
Given the life of these types of devices, considering we'll likely upgrade to the next big thing in a year or so, I don't think anyone here will come close to 'wearing out' a battery.
EMINENT1 said:
I've got the first full charge and full depletion done. Is it ok to use while charging now as long as I fully charge and fully deplete it a couple more times?
Click to expand...
Click to collapse
As stated, these are Li-Ion batteries, and they do not need to be trained. The only reason you might need to do any training is to calibrate Android's understanding of the battery (although I doubt you need to do a full discharge for that, either).
It's not going to suddenly kill it, but it will over time hurt your battery's life.
I went ahead and did a full discharge/charge cycle, but only because Asus said to do so in the manual. Maybe the copywriter just copied/pasted from a circa 1990's manual for a device with a NiCd battery, but I figured if they're suggesting it, I might as well do it.
I noticed this on my old S4 as well. 99% took the longest to charge up to the next %. Anyone know why this is? My phone was charging at 99% for like 15 minutes. I also noticed that using the phone from 100-99% goes very quick :laugh:
OnSugarHill said:
I noticed this on my old S4 as well. 99% took the longest to charge up to the next %. Anyone know why this is? My phone was charging at 99% for like 15 minutes. I also noticed that using the phone from 100-99% goes very quick :laugh:
Click to expand...
Click to collapse
This is perfectly normal. Think of it as inflating a balloon. The last 1% will be really hard and yet it will deflate as fast as the rest. It is not recommended to push that last 1% too often. Ideally you want to stay between 30-70%.
pintycar said:
This is perfectly normal. Think of it as inflating a balloon. The last 1% will be really hard and yet it will deflate as fast as the rest. It is not recommended to push that last 1% too often. Ideally you want to stay between 30-70%.
Click to expand...
Click to collapse
Do you have a source for that?
poldie said:
Do you have a source for that?
Click to expand...
Click to collapse
He is correct some say 20-80%, best example is Samsung laptops, mine had an option in the bios of topping charge of at 70% to prolong battery life.
http://batteryuniversity.com/learn/article/do_and_dont_battery_table
Check out my recharge experiments: http://forum.xda-developers.com/z3/general/xperia-z3-battery-life-recharge-t2916773
I heard somewhere that is a solution so battery dont became overcharghed.
And what kills battery capacity is if it became static. There must be electricity flow trought battery to prolong it life time.
Your only supposed to charge your phone to no more then 70%?? First i heard. Never heard that before, Interesting.
Blaalad12 said:
Your only supposed to charge your phone to no more then 70%?? First i heard. Never heard that before, Interesting.
Click to expand...
Click to collapse
I looked into the same thing last month.
https://discussions.apple.com/thread/4465051?tstart=0
When possible avoid frequent full discharges. Instead, charge the battery more often. There is no concern of battery's memory when applying unscheduled charges. A high residual charge before recharge is a benefit rather than a disadvantage for chemistry of Li-Pol battery on all iPads. The best way is to keep battery between 40% and 80% charged. After LiP battery of iPad is charged to 80% capacity it switches to trickle charging with a potential to cause plating of metallic lithium, a condition that renders the cells unstable. One more incentive to keep battery of iPad between 40-80% is the rate of the charge loss when gadget is not in use. The charge loss amounts up to 6% per year when battery is fully charged, but only 2% per year when it is half-charged. Nevertheless, short discharges with following recharges do not secure the regularly calibration needed to synchronize the fuel gauge with the battery's state-of-charge. A deliberate full discharge and recharge every 30-40 charges fixes this problem.
http://techlife.samsung.com/tips-keep-smartphone-charged-1059.html
Charge Regularly
To get the most out of your smartphone's battery, you'll need to charge it properly. Most smartphones have a lithium-ion battery that lives longer when charged regularly. Unlike the nickel batteries used in older phones, lithium-ion batteries do best when kept above a 50 percent charge. Repeatedly allowing the battery to drain fully may shorten its life and decrease its overall capacity. If this happens, you'll need to charge the battery more frequently and it may last only a few hours before needing a charge, for example.
Your battery will also perform better if you don't let it charge to 100 percent, so take it off the charger at about 80 to 90 percent capacity. Leaving the phone connected to the charger when the phone is completely charged may lower battery life if you do it repeatedly.
Actually what happens when you leave the phone connected to the charger is that it stops charging completely. I do not think it affects battery life in any noticeable way, unless you leave it for hours connected maybe.
If you're using your phone quite heavily surely you will be constantly charging if the optimal usage is between 50 and 90% of charge?
orkavaneger said:
Actually what happens when you leave the phone connected to the charger is that it stops charging completely. I do not think it affects battery life in any noticeable way, unless you leave it for hours connected maybe.
Click to expand...
Click to collapse
What will happen is that when it drops to 99%, it will charge back to 100%. Over the night, it could happen many times. It is a circulating advice for a long time now: don't let your phone on the charger for the night.
I must admit I try never to charge it overnight. I'm managing to get just over a day of use before it needs charging.
but the proof is missing, there are many such fairies in the internet, even if, after 2 years, most buy a new phone anyway. and so long holds each battery! With my s6 I still get over the day. and charge it always over night!
Thor1964 said:
but the proof is missing, there are many such fairies in the internet, even if, after 2 years, most buy a new phone anyway. and so long holds each battery! With my s6 I still get over the day. and charge it always over night!
Click to expand...
Click to collapse
I agree 100% with the above quote. There is no real proof one way or another. It is all speculation run amok.
The only fact is that the battery will slowly degrade over time. THis is what the OEM's want!
They make it very difficult to replace the battery so that you will buy a new phone... plain and simple!
Any phone built within the last two years is more than powerful enough to do anything needed for communications... the reason cell phones exist in the first place. I always charge my phones (when needed) overnight. They all last as long as any other phone.
I too am caught in this ridiculous merry-go-round of buying a new phone all the time because we want to sell them before the battery gets too old.
Progress...argh.
There's a reason why electric vehicles don't use 100% of their battery capacity
But worrying about your phone's battery life is too much of a hassle, I'll have a new phone by the time this one is useless
And since the battery is not user replaceable, it has the same warranty time as the phone. If there are problems, samsung can replace my battery
reyals1 said:
And since the battery is not user replaceable, it has the same warranty time as the phone. If there are problems, samsung can replace my battery
Click to expand...
Click to collapse
The warranty period for the S8 in the UK is 24 months but the battery is only 12 months according to Samsung's site
Sent from my SM-G950F using Tapatalk
I guess maybe the root limitation isn't so bad lol
Given that it (and the no pay apps/stuff that needs Knox) is the only remaining issue for some (SOME) people (a very few of the people who've upgraded post-root still have reported the screen issue, but none of this is scientific) , I guess one could claim that the downsides are low now!
Thor1964 said:
but the proof is missing, there are many such fairies in the internet, even if, after 2 years, most buy a new phone anyway. and so long holds each battery! With my s6 I still get over the day. and charge it always over night!
Click to expand...
Click to collapse
Here's the proof:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Google an article by Popular Mechanics, too. They said the same thing.
Also, Google what Tesla tells their owners to do.
jaseman said:
I agree 100% with the above quote. There is no real proof one way or another. It is all speculation run amok.
The only fact is that the battery will slowly degrade over time. THis is what the OEM's want!
They make it very difficult to replace the battery so that you will buy a new phone... plain and simple!
Any phone built within the last two years is more than powerful enough to do anything needed for communications... the reason cell phones exist in the first place. I always charge my phones (when needed) overnight. They all last as long as any other phone.
I too am caught in this ridiculous merry-go-round of buying a new phone all the time because we want to sell them before the battery gets too old.
Progress...argh.
Click to expand...
Click to collapse
See above.
S6 is only $150 on Swappa. Mobile phones have $h1t for residual value. Trading up to the latest and greatest isn't something everyone can afford to do every 2 years.
So, what you're saying is, in order to keep my battery from only lasting a few hours and having to charge it more frequently a couple years down the road, I should start to only use my phone for a few hours at a time and charge it more frequently right now....
How much will the battery replacement cost at Samsung?
SirNamero said:
So, what you're saying is, in order to keep my battery from only lasting a few hours and having to charge it more frequently a couple years down the road, I should start to only use my phone for a few hours at a time and charge it more frequently right now....
Click to expand...
Click to collapse
Finally someone gets it :good: made my day man.
Neo3D said:
Charge Regularly
To get the most out of your smartphone's battery, you'll need to charge it properly. Most smartphones have a lithium-ion battery that lives longer when charged regularly. Unlike the nickel batteries used in older phones, lithium-ion batteries do best when kept above a 50 percent charge. Repeatedly allowing the battery to drain fully may shorten its life and decrease its overall capacity. If this happens, you'll need to charge the battery more frequently and it may last only a few hours before needing a charge, for example.
Your battery will also perform better if you don't let it charge to 100 percent, so take it off the charger at about 80 to 90 percent capacity. Leaving the phone connected to the charger when the phone is completely charged may lower battery life if you do it repeatedly.
Click to expand...
Click to collapse
Charging your phone to 100% won't harm it. Letting it die at 0% though can harm it. Lithium-ion batteries don't like dying, but charging them to 100% won't hurt it, in fact leaving it plugged in for hours, even days afterward, also won't harm it. Chargers stop charging devices at 100%. Phones will be fine as long as you don't let them completely die. If you've ever wondered why they will still tell you the battery is "dead" when trying to power it on after it dies, that's because it's not "dead" so to speak, but the phone shut off to prevent damage to the battery.
In short, letting your phone die CAN harm it, but usually, it won't, because phones power off with some power left in them due to a "dead" battery, to protect the battery. This is why once they die you can still hold the power button and it will tell you its dead. Finally, charging your phone to 100% won't hurt it in any way, as chargers stop charging devices after they reach 100%.
CSxKING_ said:
Charging your phone to 100% won't harm it. Letting it die at 0% though can harm it. Lithium-ion batteries don't like dying, but charging them to 100% won't hurt it, in fact leaving it plugged in for hours, even days afterward, also won't harm it. Chargers stop charging devices at 100%. Phones will be fine as long as you don't let them completely die. If you've ever wondered why they will still tell you the battery is "dead" when trying to power it on after it dies, that's because it's not "dead" so to speak, but the phone shut off to prevent damage to the battery.
In short, letting your phone die CAN harm it, but usually, it won't, because phones power off with some power left in them due to a "dead" battery, to protect the battery. This is why once they die you can still hold the power button and it will tell you its dead. Finally, charging your phone to 100% won't hurt it in any way, as chargers stop charging devices after they reach 100%.
Click to expand...
Click to collapse
WRONG.
Lithium-ion suffers from stress when exposed to heat, so does keeping a cell at a high charge voltage.
Most Li-ions charge to 4.20V/cell, and every reduction in peak charge voltage of 0.10V/cell is said to double the cycle life. For example, a lithium-ion cell charged to 4.20V/cell typically delivers 300–500 cycles. If charged to only 4.10V/cell, the life can be prolonged to 600–1,000 cycles; 4.0V/cell should deliver 1,200–2,000 and 3.90V/cell should provide 2,400–4,000 cycles.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Too many users have no idea about the facts of Lithium-ion batteries, sadly. Don't spread false information, learn the facts. Charging to 100% IS stressful for any Li-ion battery. The last 10% are the most stressful when charging. That's why Sony invented "Battery Care" which will charge the last 10% very slowly exactly for this reason.
Neo3D said:
http://techlife.samsung.com/tips-keep-smartphone-charged-1059.html
Charge Regularly
To get the most out of your smartphone's battery, you'll need to charge it properly. Most smartphones have a lithium-ion battery that lives longer when charged regularly. Unlike the nickel batteries used in older phones, lithium-ion batteries do best when kept above a 50 percent charge. Repeatedly allowing the battery to drain fully may shorten its life and decrease its overall capacity. If this happens, you'll need to charge the battery more frequently and it may last only a few hours before needing a charge, for example.
Your battery will also perform better if you don't let it charge to 100 percent, so take it off the charger at about 80 to 90 percent capacity. Leaving the phone connected to the charger when the phone is completely charged may lower battery life if you do it repeatedly.
Click to expand...
Click to collapse
Technically speaking,
A source brought up a couple of months ago says that in a year, approximately 300 charges and/or more, you will lose about 30% of the year. Charging it from 50% and higher will burn out the battery even more. It's better off letting the phone go to a certain threshold of ~>15% of the battery, then charge it so it could have more longer life in these years. Its beneficial for longer life, but day to day wise no. But long story short, i don't really agree with the method you recommend us doing.
---------- Post added at 03:26 PM ---------- Previous post was at 03:24 PM ----------
CSxKING_ said:
Charging your phone to 100% won't harm it. Letting it die at 0% though can harm it. Lithium-ion batteries don't like dying, but charging them to 100% won't hurt it, in fact leaving it plugged in for hours, even days afterward, also won't harm it. Chargers stop charging devices at 100%. Phones will be fine as long as you don't let them completely die. If you've ever wondered why they will still tell you the battery is "dead" when trying to power it on after it dies, that's because it's not "dead" so to speak, but the phone shut off to prevent damage to the battery.
In short, letting your phone die CAN harm it, but usually, it won't, because phones power off with some power left in them due to a "dead" battery, to protect the battery. This is why once they die you can still hold the power button and it will tell you its dead. Finally, charging your phone to 100% won't hurt it in any way, as chargers stop charging devices after they reach 100%.
Click to expand...
Click to collapse
This is incorrect. When your phone fully dies then charges to 90-100%, it does a battery cycle. This cycle is worth doing from time to time to keep the safety of your device and battery from not overheating.
brokich said:
WRONG.
Lithium-ion suffers from stress when exposed to heat, so does keeping a cell at a high charge voltage.
Most Li-ions charge to 4.20V/cell, and every reduction in peak charge voltage of 0.10V/cell is said to double the cycle life. For example, a lithium-ion cell charged to 4.20V/cell typically delivers 300–500 cycles. If charged to only 4.10V/cell, the life can be prolonged to 600–1,000 cycles; 4.0V/cell should deliver 1,200–2,000 and 3.90V/cell should provide 2,400–4,000 cycles.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Click to expand...
Click to collapse
They Discharge Batteries too much with 3,0 Volts aka They do put too much Stress on them, bad for BatteryLife and Security depeding which Chemicals are used (INR, NMR, IMR etc). With
*18650 Li-Ion`s thats 0,2 Volts above the critical Boom Limit. Normally the safe Zone for Battery-Life and Security is 3,15V to 3,20V min.
*18650 Idustry Batteries which are used for Highdrain-Usage (Up to 35 Amps) like Battery-Scredrivers (And other Tools for Work), RC-Sports and E-Zigarettes.