For cell replacement please do some research in advance to get cells with appropriate (read: high) discharge current rating, or else your investment will be worn out soon. Also it might be useful to find a supplier that will provide cells with soldering tags. By the way: did anyone test a recent make of Sanyo Eneloop NiMH cells for recelling a PowerBook? The low self-discharge rate of those cells would make them an ideal choice for occasionally used PowerBooks. Even the Eneloop (or similar cells with extra low self-discharge rate), which have a lower nominal capacity than recent standard NiMH cells, have a higher capacity than any original cells in PowerBook 1xx series batteries.