I just got a powerbook G4 12" 867MHz...the battery seemed fine but I left it out unplugged the other nighton my floor in my roomand the cold must of drained the battery...before it would say I had a lot of time before the battery was outlike 12 or even moreand now that its recharging from 0 it says it'll take (9:46)...would you say I need a new battery?