The battery level gauge of my Asus Z8 tablet with Android 5 has been behaving abnormally of late.
When I connect the charger, the charge level icon does not show power is connected and the battery level does not move. The Ampere app shows that device is on battery. However, the battery is indeed charging and Ampere shows the battery voltage creeping up. All this time, the battery gauge shows the same level, say 40%. I let it charge for a while. The meter still reads 40%, After a bit of use, presumably when the battery level goes down to 40%, it starts going down normally. I carry on using it, and the level displayed creeps down, to say 20%.
Connect the charger again, the level stays stuck on 20%, but the battery voltage goes up.
A reboot corrects the battery level, but the behaviour stays the same, except at the new reading.
I can get an estimate of the amount of charge from the battery voltage on Ampere., so it is usable, but a pain.
What I am most worried about is that the since the OS does not appear to know the unit is in fact charging, it could overcharge if I were to simply leave it to charge overnight as I usually do.
Any ideas anyone?
Related
I'm on CM10 8/31 and I've been noticing that my battery life has been really poor lately, so I wanted to find out what the problem was. I thought about draining my battery fully and then charging it again. Once I drained the battery, I charged it, and restarted the phone after the charging began. Once the phone booted, it reported a 50% or so charge. I'm wondering if my phone is stuck at reporting battery at half capacity, and that when it charges to 100%, it's actually 50%. Anything I can do?
EDIT: Also, I should note that the battery has sometimes spiked up/down by about 20% after a reboot (including today before the drain).
This phone has a fuel gauge chip, fully discharging and recharging will not calibrate it. False readings after reboot are common, you may even notice it will climb back up as it begins to accurately reflect level.
There are apps to let you know what is causing drain. BetterBatteryStats and CPUSpy are recommended a lot.
ALBGunner04 said:
I'm on CM10 8/31 and I've been noticing that my battery life has been really poor lately, so I wanted to find out what the problem was. I thought about draining my battery fully and then charging it again. Once I drained the battery, I charged it, and restarted the phone after the charging began. Once the phone booted, it reported a 50% or so charge. I'm wondering if my phone is stuck at reporting battery at half capacity, and that when it charges to 100%, it's actually 50%. Anything I can do?
EDIT: Also, I should note that the battery has sometimes spiked up/down by about 20% after a reboot (including today before the drain).
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Click to collapse
Entropy doesn't frequent our forum much anymore, but he left some nuggets of wisdom behind.
As you have probably seen, he mentioned several times that generally our fuel gage doesn't need much attention. It may get a little out of whack if you have heavy usage followed by reboot, but generally the error is short-lived and goes away quickly (within an hour or so).
But apparently sometimes the fuel gage gets really confused, and in that case you can reset it (to un-confuse it) by powering down and pulling battery for 20-30 seconds. It certainly can't hurt to try.. that's what you try for any computer that was acting weird. That was discussed by Entropy here:
http://forum.xda-developers.com/showthread.php?t=1209087&highlight=+gingerbread+fuel+gauge+
By the way, here is a link to the fuel gage chip (MAX17040) used in Infuse
http://datasheets.maximintegrated.com/en/ds/MAX17040-MAX17041.pdf
It has a heuristic model of the battery. The only input is the battery voltage. So it looks at time history of voltage and provides an output signal. Exactly what the output is I’m not sure. You’d think it would be an estimate of %. But according to the circuit diagram there is no inputs to the MAX17040 other than battery voltage.
And yet our phone also knows when it’s charging. And our Infuse phone also has a sensor that enables it to measure current while charging (but not to measure current while discharging). This according to the developer of Battery Monitor Widget:
http://forum.xda-developers.com/showthread.php?p=31295223&highlight=infuse#post31295223
Why the heck would we not use sensed charging current and charging status as an input to calculating our % battery (since the signal does not go to the Max17040)? Beats me, doesn't make sense. Maybe the output of he fuel gage chip goes to the integrated power chip MAX8998 which looks at these other inputs (charging status and charging current) and develops the % estimate... I’m not sure.
I spend a lot of the day with my phone tethered acting as a hotspot with unmetered data for my laptop, so the battery would drain very quickly if the phone was not plugged in. But at the same time, this means that I'm constantly plugged in and maintaining my battery at 100%, or if I return after a meeting or lunch, I'd be constantly charging from 80% back to 100%. I understand that both practices (keeping the battery at 100% and charging the last 20%) are not good for the battery. Since I usually have access to a charger, I don't really need to be charged to maximum battery capacity most of the time.
Is there any way to get the Pixel 2 XL to stop charging beyond 80% ?
Searches led me to https://android.gadgethacks.com/how...oid-device-avoid-excess-battery-wear-0176280/ That tells me to set /sys/class/power_supply/battery/charging_enabled to 0 to see if it charging stops.
But my Pixel 2 doesn't have /sys/class/power_supply/battery/charging_enabled. It has /sys/class/power_supply/battery/charge_disable instead, but setting this to 1 does not seem to stop charging. So it seems unlikely that Battery Charge Limit.apk would work. Does it work for anyone else?
This is wrong lithium-ion batteries are designed to be topped off, they last the longest staying above 30%.
My understanding is that these are not good for battery lifespan:
- charging the top 20%. I.e. charging from 80-100% uses up more charge cycles than 40-60%
- keeping the battery constantly at 100%. I.e. storing at 50% is better than storing at 100%
Are these inaccurate?
And, is there a way to limit charging to xx %?
Battery Charge Limit is closest to what what you're looking for - here's the main post.
https://forum.xda-developers.com/android/apps-games/root-battery-charge-limit-t3557002
When should you charge your phone?
"Leaving your phone on the charger all night (or all day) is far better for your*battery*than running it down and charging it up. 2.*Charge*a little bit whenever you can. Lithium-ion*batteries*don't respond well to being*charged*all the way up and then run all the way down."
May 26, 2015
http://www.popularmechanics.com/technology/gadgets/a15731/best-way-to-keep-li-ion-batteries-charged/
Hi!
I am using CarbonROM 5.1 and I have a problem with the system shutting down at around 30%. The phone does not switch off immediately, but suddenly show 0% battery and shuts down properly. After restarting the phone it stays on for a few seconds and shuts down again. After connecting a charger to the switched off phone the battery level is shown between 20% and 30% and rapidly rises by around 5-15%. And with the charger connected to the phone it stays on. As soon as the battery level is over 35% I can use the phone without the charger... by the time we reach 30% again.
Do I need to replace the battery?
It's a good indication of a bad battery. If you open the device up, you will most likely notice that the battery is slightly swollen.
That happens to LiPo batteries that are about to die/are dead.
They start their death with the sign as you describe it. They can't supply the device with enough current at lover voltages any more (increased internal resistance). This causes the battery to drastically drop in voltage and the device suddenly shuts down due to the too low voltage.
One thing i've always wanted to know is if we plug our phones at 100% battery it still uses power from the battery and keep charging it over and over. Or if it uses power directly of the wall without consuming battery.
I want to use my phone for longer periods but im worried about battery health in the long run
fabricio7p said:
One thing i've always wanted to know is if we plug our phones at 100% battery it still uses power from the battery and keep charging it over and over. Or if it uses power directly of the wall without consuming battery.
I want to use my phone for longer periods but im worried about battery health in the long run
Click to expand...
Click to collapse
The common recommendation for battery health on most smartphones with Li ion battery, is to charge often (avoid deep discharge/charge cycles), and not leave it on the charger for long periods of time when it is fully charged.
When connected to the charger and fully charged, it will let the battery drop slightly, then recharge, over and over again. I've seen the battery meter on this phone drop down from 100% to 99% when connected to the charger. Although I have a feeling it is doing this a lot more than you would be able to detect from the % meter.
redpoint73 said:
The common recommendation for battery health on most smartphones with Li ion battery, is to charge often (avoid deep discharge/charge cycles), and not leave it on the charger for long periods of time when it is fully charged.
When connected to the charger and fully charged, it will let the battery drop slightly, then recharge, over and over again. I've seen the battery meter on this phone drop down from 100% to 99% when connected to the charger. Although I have a feeling it is doing this a lot more than you would be able to detect from the % meter.
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I see, so no aparent benefit in using it with power cable conected.
thank you
fabricio7p said:
I see, so no aparent benefit in using it with power cable conected.
Click to expand...
Click to collapse
In fact, more likely to be harmful than beneficial. I'd say it is better to use it for a while, let the charge drop (say down to 60-80%) than recharge to full, and disconnect the charger (don't leave it charging after it is full).
I should add that this is somewhat debatable. I don't follow all these rules myself. I'm pretty sloppy about putting the phone on the charger when I go to bed, and not unplugging it until I wake up. So plugged in for 8 hours or so, when it only takes 1-2 hours to charge to full. And we all drain the battery pretty low from time to time. So again, the is the deep discharging that should generally be avoided.
But if you want general guidelines or "best practice" than there it is.
I think its good idea to leave phone charging
If you want to charge the battery to the top end, you can charge it to 100%, let half a hour for the battery to cool and for the ions to set into some equilibrium state, and then you can charge it for a little bit more. (The battery percentage will not necessarily show it. The battery voltage is not all the time 100% correlated with its electric charge).
But as redpoint73 said, the common recommendation for Li ion battery is to disconnect it from charger while full.
Hi everyone, im having a problem with this phone:
1- Charging the phone never reach 100% in one charge, it always stops charing at a random number, for example 70%, no matter how much time i let the phone charging it never goes past that. The solution is unplug and plug again, then it reaches 100%.
2- The number 1 is not a big deal but this is. The phone automatically turn off at a random number again, let say 66%, and i cant turn it on. If i connect the phone to the charger it says 0% battery. Is not like the % freezes at 66% and i use it all day and then turn off. For example, i have the phone at 100%, i start using it and i see the % going down like normal and after an hour or two of using it suddenly turn off and im not able to turn it on again because the battery is at 0%.
I tried:
Hard reset, wiping cache, data.
Hard reset, wiping cache, data and installing the latest stock rom.
New battery.
Different charger.
I have no idea what else to try, anyone have a clue?
Thanks!
I think the battery is broken, also had the problem. Then I bought me one on Ebay for 9,99€ and now everything is good again.
Try using a -known- good cable and charger.
Make sure the port contacts are clean and debris free. Always charge with screen off.
You can also try powering the phone off and see if this alters its charging pattern.
My best guess...
When it auto shuts down again pull the battery and measure its actual voltage to determine if it's at about 6%.
If actual voltage indicates it's at 6%* may be a bad battery (limited capacity) or a hardware failure (shutting the charge cycle down prematurely).
If battery actually has 20% or higher when the phone shuts down) it indicates a hardware failure in the phone.
If battery temp exceeds about 102°F during charging the phone will abort the charge; make sure this isn't the cause. A hot charging battery in a cool room could indicate a battery or hardware failure. If battery temp exceeds 107°F or so in operation the phone may also auto shutdown.
Excessive cold (>32°F) will effect battery capacity severely.
Don't charge a cold Li battery (under 70°F).
Never charge if at or below freezing**.
Li's like a charge temp range of 80-95°F
They prefer frequent, short mid range charge cycles (40-65%) vs topping them off beyond 80%
*hunt down the voltage/% charge for this battery
**can cause Li plating which will permanently degrade the cell