MBP shutting down unexpectedly even though battery meter still has charge

Hi,
just in this last week, my MBP has been shutting itself down very suddenly when on battery power when there's still charge left.
At first there was about 25% charge left. Over the next few days, that went up progressively till today it is now shutting itself down with more than 50% charge left.
Has anyone had issues such as this? and what should i do to rectify it?
I'm going to try recalibrating the battery.
I don't usually use the MBP with the power connected
I try where I can to charge and then disconnect and use till power is low.

I was having same problem: meter shows plenty of charge left, yet MBP shuts down. When I decided to take a look at my battery (also with recall in mind) was horrified to find it swollen and warped so badly -- pushing out of its casing. Could barely get it out and then back in. That I'm getting any charge at all amazes me considering how badly the battery is misshapen.
Has anyone else had this problem? I'm beginning to think Apple's not being quite up-front about the seriousness of the problem: Yes, MBP gets hot, yet no more than my old PowerBook and iBooks.
But, had we been given batteries which are perhaps really unsafe, not to mention causing lost work time and maybe systemic difficulties?
MacBook Pro 15"   Mac OS X (10.4.6)  

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