I have an iBook G3 600 (dual USB) that suffered a bad power surge and was left for dead (wouldn't boot, no lights on power adapter, etc). I recently tossed a different battery in it, and it booted right up - it apparently can no longer run off of the AC adapter or charge, but can run fine off a battery.

I've tried several DC-IN boards, but it doesn't fix the issue (and sparks, quite a bit) - I think the PMU is shorted out in a spectacular fashion.

I'm trying to use this thing for a media jukebox project, so I really don't care about portability at this point. What I would LIKE to do is lose the battery, then try to wire a power adapter through the battery terminals and power it that way - does anyone know if this might be possible? If anyone has a pinout for the G3 ibook batteries, I would appreciate it.

Yes it can be done. I can't find any pinouts for it but you can use a volt meter and test the battery to see whats voltage and what is ground. After that then you can wire into the logic board's battery terminals.

Someone with my same Prob.
Same thing with a 500 system.

I did some work and got this;

pins 1,2,5,6 1,2 DCV pins 34 3 DCV.

You will want 1 amp or more.

I havent got this to work yet...