[mrpurple_]

Charging slower is always better for lion based batteries. Period

[IndrekR]

For battery lifetime -- also charging to lower voltage and stopping discharging at higher voltage. Cathode will stay intact longer this way and metallic lithium has less chance on plating the anode.

[sm4rk0]

There's an Android app for that (if the device is rooted)

https://f-droid.org/app/com.slash.batterychargelimit