This is a rechargeable battery for the white Apple white iBook G3 & G4. Specification for 12": LiIon, 10.8V, 4400mAh; Specification for 14": 14.4V, 4400mah (These are higher capacity batteries than the original Apple batteries, and that translates into longer life!)Choose your display size from the drop down box below to make sure you are sent the correct battery for your model! (To determine your display size, you need to measure the diagonal of the screen. The diagonal being the top left corner to the bottom right hand corner.)