Weird laptop problem

[Mo0o]

When i run my laptop on battery life it'll show a steady drain till about 80% (this lasts maybe 20 minutes) then all of the sudden it'll show critical power and it'll be at 4%. So in total my laptop maybe has 25 minutes of battery life. what can be the problem?

The only explanation i can think of is that the battery is too old. I've had this laptop for over a year and its been plugged into the wall for most of the time because i dont take it around that often. can it be that the battery is overcharged or something? what i dont get is that theres a steady drain in teh first 20 %

oh btw i have a Toshiba Satellite 1105, i have no idea what kind of battery it is.

I already posted in the laptop forum but since so many people read ATOT i figure i give this a shot

thanks

 

[rival]

battery could be broken or someting, maybe try completely draining it, then let it recharge fully
drain it again, recharge it? duno

 

[sk560]

this try what rival has suggested... recondition. the battery / power management might not be reporting the correct data.... over a period of time.