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Re: HTC M8 with a case bad?
In general, you can safely charge a Li-ion battery at a rate equal to it's capacity. I.e. the M8's 2600mAh battery can be charged up to 2600mA (2.6A) without worry, not accounting for any additional overhead to power the phone while charging. Considering our OEM charger is rated at 1.5A, it's obvious that both the phone is regulating the current pulled and we're well below that threshold. Two things about fast charging on our phones. Yes it will need a special charger that is designed for it and the phone can detect, but also means the battery must already be built for it. That last part isn't anything too new, as technologies have allowed Li-ion batteries to be charged at 2-3X the capacity rating. Not all of them can, and removable batteries on external chargers should not be charged at a higher rate unless it specifically says so (usually listed as the C rating). Since ours is non-removable but is apparently Quick Charge 2.0 compatible, it's safe to assume the battery can handle it. With higher charge rated, the battery will get warmer than what we normally expect. I wouldn't worry about that, but I WOULD worry about it getting hot on the stock charger if the phone is off or at idle.
Originally Posted by Relgoshan
If it's getting hot at random, it's hard to guess why. Could check the battery usage stats for any clues.
Originally Posted by AnimalMotherASF
As for drilling holes, that probably won't amount to much because there wouldn't be much air flow. Unless your case is just really thick/insulated, maybe.