Type of/Screw size dimensions for battery case of the Nintendo DSi

Hey, I have recently been swapping out some batteries for my DSi, testing to see which lasted the longest. This made it so that I had to open my battery case multiple times to swap them out and now the screws are stripped, and I can no longer fully tighten the case. I can't seem to find any information on the screws themselves, but I was wondering if anyone knew the exact type/name/measurements of these screws so I can buy a bunch of philips replacement ones?