Quote:
Originally Posted by kermitology
Usually when getting a new battery it's a good idea to do one deep discharge on it at first, then fully recharge it and try to keep it topped up.
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Ideally you need to let the battery fully charge, then leave it connected to the charger for a few hours after it reports fully charged so that it settles. Then, use it all the way until the phone powers off on its own, then leave plugged in for a full uninterrupted recharge to 100%
The reason for doing this is to calibrate the battery gauge - like laptops, phones these days need to be calibrated to learn the discharge curve of the battery, which is how they determine the current charge level. That’s why you start from 100%, go all the way to zero, and then all the way back up, when you first get a device.
You can also do this every couple of months to re-calibrate the device. I wouldn’t do it more than every couple of months, because, as people have already noted, going all the way to 0% charge on a lithium battery is hard on them.