If available, limit the charging current to ~50% of its factory value (this may or may not help, depending on how this limit is implemented in the device).The same approach is used in battery-powered vehicles. This gives a very good compromise between having all the battery capacity vs preventing accelerated battery aging under heavy phone use. Note: a lot of modern phones (incliding recent iPhone models, as well as other recent high-end phones) have this charging limit enabled by default and top up the battery all the way to 100% only off-hours. Limit the battery charging to 60-90% by whatever means available (and accept that you will have 60-90% battery when unplugged). Look for chargers supporting high-power charging protocols like USB-PD or QuickCharge (the phone has to support them too). If a powerful enough charger is connected, the battery is asked for power just rarely (or never).
The battery is recharged back when the power demand is less, burning up the possible charge/discharge cycles. Important because a lot of chargers cannot meet the peak demand and in some cases their power is supplemented by the battery. What to do when the device is under a constant load and external power is available: Worse when done to a cold battery, here the higher temperature somewhat helps.Ĭharging the battery at high rate (worse when the temperature is also high). Again relative, because one can trade off capacity vs longevity and discharge a battery down to 3.1V or 2.8V. Especially bad when combined with p.1ĭischarging them with high current when nearly empty. There are settings/applications that can limit the charging to less than 100% (of whatever the phone vendor thinks is 100%). And these numbers are relative either because different chemistries have them somewhat off.
But this is relative, because these 100% are left at the vendor discretion - some vendors just derate the battery and say it is 100% charged at 4.10V when others would consider the same battery at the same voltate as being like 85% charged and pump it all the way up to 4.35V. What is pretty much known to degrade them: Li-Ion (and their subset Li-Poymer) batteries are much more complex than "above and below 50%".
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