Set battery charge custom stop charging in percent.
Battery stops charging when it reaches the battery charge custom stop charging value.
DeviceBatteryChargeCustomStartCharging must be at least five percentage points below DeviceBatteryChargeCustomStopCharging.
This policy is only used if DeviceBatteryChargeMode is set to "custom".
If this policy is not configured or left unset, the "standard" battery charge mode will be applied.