HELP: Datel MAX Power (gray) doesn't fit in PSP Fat.

I just got a MAX Power 3.6 1800mAh (http://psp-homebrew.eu/images/pandoras-vguide-full.jpg the GRAY one) for xmas.

I just tried to fit it into my PSP and it doesn't fit, even though it's same dimensions as the original PSP battery. On the reverse side (the label showing LITHIUM-POLYMER MADE IN CHINA, etc), has a slight curve outwards. It appears internally has expanded due to the frosty weather conditions or something.

I would like to confirm with anyone who has a Datel GRAY MAX Power battery. Can it fit in your PSP Fat?

I don't have one, but it should fit
Maybe it deformed because of the weather as you say

I manage to squeeze it in with some "extra love".

The battery works OK. But yes, it discharges slowly, even when am not using the PSP.

Hope it doesn't explode or something...