Since we are off-topic already anyway...

Is there a way to stop charging the battery before it reaches 100%? I have recently purchased a semi-functional N900 that I want to use as a kind of home server permanently plugged in the mains. To extend the battery life, I would like to stop it charging when it reaches something like 80% rather than 100%. Is that possible?

Sorry if asked/answered elsewhere (putting flak vest on ).