I noticed that Rockbox handles it differently when the battery is charging and when it's fully charged.
Under Debug -> View battery I see the following while charging.
Charger: present
State: Charging
CHARGER: 2C
After charging finishes, I see the following when it's charged.
Charger: present
State: Discharging
CHARGER: 81
However charge level is not changing, stays at 100%. Is the battery used (drained and then recharged immediately) on Sansa Clip+ after charging? Or is it kept completely idle while the USB charging voltage is present?
So if I want to save some battery lifetime by not draining it too many times, can I do it by using it from USB power every time when possible?