Bulging battery on MacBook Pro

The battery in my MacBook Pro has a massive bulge of 5mm height of 1/3 of the surface. The battery is about 8" by 2.5", and can be divided in 3 zones as seen in the photograph: on the right, a 3.5x2.5 zone that is OK, then a 2.5x2.5 central zone grossly bulged and at the left a 2x2.5 OK zone. The central zone applies great pressure on the trackpad, failing the clicking, and distorting the bottom of the unit. I believe that the Li ion Polymer battery -though still keeping charge- is very dangerous, even more though that the bulge cannot be detected from the outside; the telltales of the dangerous battery are [1] the failure of the left click of the trackpad [2] the slight distortion of the bottom. Did Apple issued a warning to look for telltales of failure? Was the battery recalled ?

Unit: MacBook Pro 13.3' A1278 2x2.4 Core 2 Duo/DDR3-4GB/SATA250GB

Picture: battery folded over to show the massive bulge lining up with the left click area of the track pad; when in position, the bulge applies great pressure on the pad.

Battery: A1322 Li Ion Polymer 10.95V 63.5Wh