Any opinions on this concerning nitelite rechargable batteries. I know most rechargable batteries form a memory if they are charged to many time without being completely drained or if they're not completely charged after a full drain. Any or opinions on this? My directions say to charge it after every use (2.5 hrs for every hour used) or once every month. They can be charged up to 24 hours if the battery is completely drained but it says to not to over charge. It has no light that says when it's fully charged though. Should I drain it every week to charge it fully?