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3 ways you're killing your battery while it charges

There are a few things you should not do with your battery. The limited two-year lifespan of lithium-ion batteries can be reduced even further if you don't avoid certain behaviors. We'll tell you which ones they are in this article.

The battery is the most sensitive part of our smartphones and their usable lifespans can be affected by our behavior. Several series of measurements by the Battery University have produced significant results. Now, get ready for the shocking findings.

androipit smartphone battery attack 9
Don't do it...look after your phone battery. / © ANDROIDPIT

Don't charge your smartphone at a computer

Charging via the USB port of your PC not only takes longer, it is also harmful. Tensions of USB ports often vary and create greater heat generation. This has an affect on the service life of batteries. The materials used for electrodes and electrolytes are really stable only in a small temperature spectrum and they dislike when you rip them from their comfort zone.

If your charge your battery hard, especially in connection with high voltages, it can lose capacity within a few months. The Battery University notes a fall to 65 percent of its original capacity when the battery is warmed to 40 degrees Celsius.

So, ideally, use the original charger and connect it to an electrical outlet. The supplied transformer provides a direct current, which should not heat a battery - thus maximizing its service life.

There's a good and a bad way to charge. / © ANDROIDPIT

Don't completely drain your battery

If your battery level drops to 2 percent, it is already too late to find a charging socket. Be aware that if your battery discharges too deeply, it may cause damage and premature aging.

In its long-term test, the Battery University found that regular, to-the-limit discharging led to an overall lifespan of only 300 to 500 charge cycles, while batteries which had been discharged to only 25 to 50 percent could reach 1,000 to 2,500 cycles.

So don't shy away from charging the battery even if there's another 30 or 50 percent charge left.

samsung galaxy s6 battery
A smartphone battery is like a delicate flower. / © ANDROIDPIT

Don't charge the battery overnight

The structure of the battery is so composed that, during charging, the lithium ions are pressed into a graphite lattice. The problem here is that the lithium ions react nastily with crystals when they meet and connect. And the greater the battery is charged, the more likely these connections are.

These crystals are sharp, big and destructive. They are so large that the graphite lattice, which should be confined, actually break up little by little. And with fewer of these individual cells remaining, there is logically less space for lithium-ion...ergo less battery capacity.

de teaser
Do you know what your smartphone battery is made of? / © AndroidPIT

So don't charge your battery to 100 percent. Unfortunately, there is no app that stops charging at, say, 80 percent so you must make sure yourself that your smartphone is not overcharged. Battery University even found that when you regularly charge your battery to only 70 percent, you can still get more than 1000 cycles from it.



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  • My cell hone has a "non-replaceable," fast-charge battery. And I notice a few things about this battery --

    1) The battery is actually replaceable, just that replacing it is a little more complicated in than it has a cable with a snap-on plug, and it has a lid over it held on by screws, with a seal that if broken voids the warranty. However several people have already replaced the battery without any ill effects, and in another month my 1-year warranty will be up anyway. I have already purchased replacement OEM batteries on-line as a precaution, but so far I have had no problems with the original battery.

    2) The battery gets very hot if I use the phone's screen while charging it. Since heat is the enemy of all electronics, I stopped using the phone's screen while charging it, and I turned off the screensaver (Daydream), which only runs when the phone is charging, because Daydream also makes the phone run hot while charging. If the phone rings while charging, I unplug it while taking the call. Or if I want to do something that uses the screen I unplug the charger first. It seems to be the monster screen (6" superAMOLED 1440x2560) that causes the battery overheating while charging, because It doesn't overheat if I just play music through earphones while the screen is off.

    3) I never run the battery down low on purpose, though it has been down as low as 5% once in a while when I have neglected to put it on the charger. Most of the time I am charging from 75% and I leave it on the charger most of the time when I'm not using it -- and it stays cool -- indicating that at 100% it is maybe just doing a very low trickle charge. Since it is a fast-charge system, it will fully charge (0 to 100%) in less than 2-hours, so its not like I have to wait an inordinate amount of time.

    Some of this is applicable to replaceable batteries -- if it gets hot while charging, turn off the screen.

  • My laptop has an option to turn off the battery charger while remaining plugged in (and operating).
    While I understand removing the battery is the best way to prolong life, I prefer to keep my battery in the laptop so I don’t lose work in case of a power glitch or failure. Each time I start my computer, it reminds me my battery is not being charged and tells me how much charge is left. In two weeks, it has already dropped to 88% charge and my computer is brand new.
    My question is, if I want to prolong the batteries life, at what charge level should I turn the charger back on? How long would you expect it to take to reach that charge level?

  • Let's crunch some speculative and easy numbers ...

    Case #1: Charge from 30% to 90% and get say 1500 cycles? >> (90 - 30) * 1500 = 90,000
    Case #2: Charge from 10% to 100% for 500 cycles >> (100 - 10) * 500 = 45,000

    So it appears you can double your battery's useful power delivery with a LOT of attention to detail.

    My recent experience has taught me to buy a spare battery somewhere in the 12 to 18 month time frame and be ready for the ... "it's going to happen battery failure." I simply can not purchase a phone that requires "servicing" to replace a battery!

    Days waiting on phone battery to arrive are miserable.

    A sale's rep suggested buying a cheap phone that uses the same carrier and transferring the SIM card. But then you have to manage the backup phone battery too. At least a lot cheaper than having to pay for a second phone line each month. Keep the spare phone battery disconnected and every month or so install the battery and check its charge? No SIM card needed for battery check and charging. This sounds reasonable ... but I have yet to do so. Any feedback from those that have would be appreciated.

  • I have respected all that things but i charge with The usb port of my tablet because the ac port of that isnt working and i cant charge with it. :(

    • Charging from my USB port charges the battery in my Moto E at about 250mA, while charging with the supplied (AC) charger charges at about 500mA. It has been my thinking that slower charging is easier on the battery. While charging at 250mA from USB port, battery temp is 30C.

  • Not true! It all depends on the quality of the battery, certain after market OEM battery (especially from China , nearly all of them anyway) konked out faster than others due to their build quality. Others can outlast even from the original manufacturers. But I thought that once in a while you have to fully discharge it to to near zero (mostly below 5%) to "cycle it" and then charge it to full again.(this was told by a bygone era school of thoughts NiMH /NiCd time)
    I dont know from which era phone this guy Eric has but most new phones just shutdown its charging once has reached 100% , (you can check that during active charging the phone is "hot" and even overnite charging after full will leave the phone "cool" because it shuts down the charging.

  • Joe Cline Jun 20, 2015 Link to comment

    I think most if not all of this is not correct. I run an inspection business we use Galaxy Note IV phones for reporting devices and phones a dozen of them. We run the batteries dead or almost dead every day, charge them over night every day. Haven't replaced a battery yet in any of the phones. We have great service life and the devices work very well. The only problem we have is that they are fragile you only drop them once. The real glass screen protectors have helped with this problem. I also would not buy a device that does not have a replace able battery. If we are on a very hard and detailed job site we may run a battery dead towards the end of a 12 to 18 hour day, We than take out the battery and put a spare in and keep working. We use these devices very hard.

  • Thanks android pit for another learning :)

  • My my, I'm guilty of 2 of the 3 ways of killing my battery. I charge while sleeping(which is quite alot - hahaha) and start charging when it reaches 2%. Wow my sis has the best of advice. She starts hers always at the 30% or above. Way to go sis.

  • Another thing which is wrong in this article is NOT to charge 100 percent ! i think they should do home work before posting , if you wont charge 100 percent for a month or 2 the battery will loose its capacity too . please read more about batteries on wikipedia .

    Nadeem Ahmed

  • i m not totally agree with this article as the better phones are having builtin charge shutdown system when the battery is fully charged , thus you can see IF you plug your phone into charger over night and u can check the adopter as well as the battery / phone is totally cool (not hot) in the morning that is the clear meaning that the battery is not being charged on the same rate since night till morning .
    you can check this by placing a digital multi meter and check the micro DC amps .
    i m not totally agree with this article . any how .

    Nadeem Ahmed

  • It's something to read about and pass the time. Better not to charge overnight, not because of overcharging, but to avoid any short circuit.

  • Mark G. Jun 18, 2015 Link to comment

    Is the article saying that I should not let the battery drop bellow 50% and to only charge it to maximum 90/95%?
    Is that the optimum charging cycle?

    Would this not mean I'd be charging more often therfore degrading the capacity quicker?


  • Angelo Jun 17, 2015 Link to comment

    Who gives a crap. Buy a new battery when your current one bites the dust (which is probably 3+ years). By then you'll be wanting a sleek new model anyways! Find something else more productive to write about.

  • Abhinav Jun 17, 2015 Link to comment

    A full bucket of thanks

  • I have had Galaxies 2, 3, Note and currently Note edge. Whenever I am not away from my desk my phone is plugged into a charger, including through the night. I have never suffered any significant reduction in battery life (other than following some android update or installation of power hungry app). Even if a battery had started to "fade", as all do eventually, then replacements are easily obtained. Back when I spent a lot of time out and about I did buy a spare 3rd party battery to carry as a spare. While it charged and worked OK I did notice that it got hotter than the original samsung battery so if I ever do this again I will pay a little more for the original battery. I think this article is worrying people unecessarily about behaviors that dont seem to cause problems for most people

  • ithehappy Jun 17, 2015 Link to comment

    Knew the last two points but don't charge your device via USB cable is literally impossible for me to follow. Even if I knew that not charging via USB cable might make the battery last twice as longer, I would not do that, but its just me.

    • I'm pretty sure every smartphone charges via a USB cable (and some through induction charging, which is still powered by a USB cable). Number one in this article says not to charge through a computer's USB port. Charge it with the factory supplied charger and USB cable instead (plug it into the wall).

  • I'm a retired engineer and the first thing that came to mind [also] was "hogwash". The author apparently groped for keywords and took statements out of context. Most of the content applied to managing bare cells, not the phone batteries under watchful eyes of power management circuits. The internal management keeps the battery from going out of limits, providing the user with an in-range percentage and shutting down the phone before the battery is dragged-out of it. And not all phones are using Li-Ion. Charging from computer port? Unless you also see exploding thumb drives there's nothing wrong with that except it'll probably take longer.... Remember the management circuits in the phone? Trust them.... The battery does.

    • K. M. M. Jun 18, 2015 Link to comment

      Fully agreed (not 'cause I am colleague..). Just from experience: my Samsung S3 is now 3 (!) years old, I am charging it nearly always overnight, mostly up to 100% (accdg to it's display!), I am sometimes charging via USB port from computer or in the car (but mostly too slow), I am sometimes charging wirelessly (with a no-OEM retrofit) - and despite all that my battery still goes strong! BUT I try avoiding heat for processor AND battery (eg by these secretly running apps) as good as possible...

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