Pencentra 200 Internal Battery Replacement

Would anyone please explain how I could replace the internal battery of my Pencentra 200. It will not charge anymore and is permanently reported as charge state = 'Very Low'. I appreciate I will have to dismantle the Pencentra so looking for advice from any one ahead of me? Thanks

IIRC, you can't hard reset a 200 without removing the backup cell? Well, this is a chance to rid yourself of that silly problem forever.

I'll suggest if you have to pull the 200 apart to replace the battery you might want to make a mod.

Take one side on the battery and run it to a tiny momentary normally closed switch. Drill a suitable hole in the 200 case where you can access the tiny switch and mount it there.

When you're done a hard reset will consist of removing the main cell and pressing the tiny switch.
Full hard reset. Load software and go.

gee that's serious. no hard reset without disassembling the machine? how stupid.