I bought a g4 laptop for vintage computing, but once the initial excitement retired I kept it on bookshelf. I don't regret buying it because it only cost 50 bucks including postal charge and even the battery still works.
So yeah I agree with a fellow commentor that if you don't know what to do maybe find someone who can pay premium and sell it.
Might want to keep the battery charged every so often or it will die completely. My iBook G4 batteries from ~2004 still hold plenty of charge, surprisingly enough! I've had far newer laptop batteries die completely because I forgot to recharge them... :(
So yeah I agree with a fellow commentor that if you don't know what to do maybe find someone who can pay premium and sell it.