Replacement Screws Needed For Restoration

Hello, I have the Jawbone Big Jambox (illustrated above) and I'm trying to replace the battery.

In the process of doing so I've stripped a few of the screw heads and need to replace them.

Does anyone know the specifications on these screws? I know they are a button head and receive a T6 driver but don't know variability like thread spacing (?) and the units used to determine length.

Thanks!