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Should I always charge my smartphone battery to 100% and let it go down to 0%?

Should I always charge my smartphone battery to 100% and let it go down to 0% for best battery life?

Most Useful Answer kariny  Dec. 18, 2013 at 09:35

You don't need to charge to 100% and charge it till the battery is 0%, people said charge battery from 0% to 100% is no help to extend battery life. Besides, you can buy a portable charger in case phone power off when you are outside. I highly recommended Kinkoo: http://www.ikinkoo.com/shop/portable-charger/kinkoo-infinite-one-8000mah.html . I bought one and it works great with 8000 mAh.

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7 comments

fotocopy  Oct. 7, 2013 at 14:18

I've read loads of articles about it. Apparently you don't need to, but also shouldn't overcharge your phone.
Even if needed, wouldn't it be too much of a pain to always do that?

JanSt / MOD  Oct. 7, 2013 at 14:40

recently there was a study that suggested we should never ever charge to 100%.
Apparently, so the researchers, from 90% or thereabouts, the battery gets heated that little bit extra. No catastrophic, but over time it eats into the battery's expected life time.

Not sure if other studies have reproduced the results since, but anyhoo...
Incidentally, I find the last 5% make little difference on my N9 and iPhone 5.
But maybe it's my warped perception.

cowbutt  Oct. 12, 2013 at 07:51

No! That advice is for old NiCd rechargeable batteries to avoid the so-called 'memory effect'. Modern Lithium rechargeables as used in phones and laptops don't suffer quite so badly from it, are prematurely-aged when fully drained, and so incorporate an intelligent controller that (should) prevent so doing.

Use and charge Lithium rechargeables as you need to. Try not to leave them on charge too long; if it's a laptop, use if off of battery rather than AC regularly; don't let them get hot (whether through charging, or being left in a hot place, i.e. a car cabin on a summer's day).

JanSt / MOD  Oct. 12, 2013 at 08:32

Couldn't find the original, but here's the Daily Hell's reportage on the study I mentioned. They are clearly talking about current devices. It IS not old advice - which is why it was reported on!
http://www.dailymail.co.uk/sciencetech/article-2352232/The-best-ways-stop-smartphone-battery-running-AVOID-fully-charging-dont-let-drop-50-sun.html

JanSt / MOD  Oct. 12, 2013 at 08:34

PS: again, I don't claim this as gospel.
But since Li-io batteries are a relatively new thing - especially in millions of devices rushed to market to replenish our desire for kicks, I would tend towards erring on the side of caution.

cowbutt  Oct. 12, 2013 at 11:17

Couldn't find the original, but here's the Daily Hell's reportage on the study I mentioned. They are clearly talking about current devices. It IS not old advice - which is why it was reported on!
http://www.dailymail.co.uk/sciencetech/article-2352232/The-best-ways-stop-smartphone-battery-running-AVOID-fully-charging-dont-let-drop-50-sun.html


My reply was to the OP (blame stupid web forum threading; ye olde mailing list or USENET would have made this perfectly apparent). In fact, my advice is remarkably similar to that you reference.

I don't think charging to 100% makes much difference, and is certainly less harmful than (attempting to) fully discharge. The only issue is that if you leave a device on charge for a long time, the battery will self-discharge to 98/99% then charge upto 100% again before repeating the cycle. That's more of an issue for laptops than phones, though.

kariny  Dec. 18, 2013 at 09:35

You don't need to charge to 100% and charge it till the battery is 0%, people said charge battery from 0% to 100% is no help to extend battery life. Besides, you can buy a portable charger in case phone power off when you are outside. I highly recommended Kinkoo: http://www.ikinkoo.com/shop/portable-charger/kinkoo-infinite-one-8000mah.html . I bought one and it works great with 8000 mAh.

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