The powerbook will work fine without the battery as long as it is plugged into the wall. Just flip out the lever in front of the battery to remove it.
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PB G4 15" 1.2ghz - Pismo G3 400 mhz - iBook G3 500 "Jukebox"
"SawSmurf" G4 500 - Quicksilver G4 Dual 1ghz modding...