Seriously, the iBook lasts 4 hours under regular conditions quite easily, but my 12" PB only lasts 3 to 3h20min on regular settings (ie: my regular screen brightness and CPU setting). That's disgraceful. Why not just use the iBook's battery? The new 12" iBook is almost the exact same as my rev B 12" Powerbook, so why even bother using the PB battery? Doesn't it seem obvious that the solution is just to use the iBook's? Is that how APple got the new PB battery? Think about it: Rev B 12" PB = 3h battery life. 12" iBook = 4+ hours....almost same technical system specs. Doesn't make sense to me.