12" pbook battery/meter problem

im hoping someone can help me out with this problem i am having. i have a 12inch pbook rev A and theres something wrong with the battery or battery meter. When the pbook is fully charged the meter will drop down at a normal rate to around 55 % and then the computer will just shut off as if the battery is dead. If i then plug it in to charge it it says that the battery is at 0 %. i am only getting somewhere around an hour until the meter drops down to around 55% and shuts off.
anyone have any help to offer me? please.

 

why do you think its a battery problem? i checked my battery capacity in terminal and it was fine. id like to be pretty sure its the battery before i go out and buy a new one.

 

ok i reset the pmu and i hope this works.

the battery is as old as the computer..about 1 year and 4 months or so.

 

well, it just died at 30 %. darn.
any other suggestions anyone? i really dont want to have to buy a new battery..especially if that wont even fix teh problem.
i really cant even afford to buy a new battery