r/technology – Lithium-Ion Battery Care Guide – Part Four


Many people plug in their cellphone before going to sleep and wake up to a fully charged phone. Most phone chargers will fully charge the device in 1-3 hours and then it spends up to 8 hours or more at full charge. This is one of the big reasons phone batteries are toast after a year or two — it has spent more than 1/3 of its life at 100% charge. There are several ways to work around this problem. One is to charge to 80% and then unplug from the charger. This way it is not spending any time at 100%. Or even better, charge it in the morning (so it does not spend overnight at 80%). Plug it in after you wake up and by the time you are ready to leave for work (or WFH) it should be charged to whatever percentage you’re aiming for. This allows the battery to spend much more time at a lower charge level.


Many people plug in their cellphone before going to sleep and wake up to a fully charged phone. Most phone chargers will fully charge the device in 1-3 hours and then it spends up to 8 hours or more at full charge. This is one of the big reasons phone batteries are toast after a year or two — it has spent more than 1/3 of its life at 100% charge. There are several ways to work around this problem. One is to charge to 80% and then unplug from the charger. This way it is not spending any time at 100%. Or even better, charge it in the morning (so it does not spend overnight at 80%). Plug it in after you wake up and by the time you are ready to leave for work (or WFH) it should be charged to whatever percentage you’re aiming for. This allows the battery to spend much more time at a lower charge level.

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