Quote:
Originally Posted by davidfor
And that's another one of the bits of advice that's not really right.
Li-Ion batteries have no real problem with running them down to zero. The problem is if you leave them there. If you leave them long enough, they will self-discharge until they get to a point that recharging them is dangerous.
And if the point is to calibrate the meter, you have to discharge the battery completely. Then recharge it completely. And repeat two or three times.
You are right that it is better not to completely discharge Li-Ion batteries. But, it is also better not to completely fill them. A suggestion is to keep them between 30% and 70% or 20% and 80%. But, doing that is generally impractical, and probably won't extend the battery life enough to make the hassle worth it.
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I read that you can just keep topping them off, without too much problem, but letting them run completely dry is bad (though, I doubt you can let them run completely dry with any electrical device, as the device will probably require more than the battery can deliver at one point, without the battery being flat). So, if the device says the battery is empty doesn't mean the battery is really empty. It just doesn't have enough juice in it anymore to power up your device. Naturally, when you leave that device for an extended time off the charger, it'll finally copletely drain.
I just charge all devices I have once every so many months, to keep the battery from slowly emptying itself completely.