The battery chosen for installation was a replacement battery for a Sony PSP. He was able to find one, including the external charge regulator board for $10. Dropping it into the case and wiring ...

The end result is a direct, drop-in replacement for the original Discman battery with a higher capacity, that’s also rechargeable via USB. It’s a fantastic project, with the entire build video ...

0.2 - updated to support 3.71 syscon NIDs, should work under every SE/OE/M33 version to date. 0.1 - initial release, confirmed working in 3.52m33 and 3.60m33(slim) with PSP-1000 type batteries ...