Here you can compare the prices for rechargeable batteries Apple, get acquainted with photos and technical characteristics (for example VIP points, Battery LED indicator, Balance connector, Capacity, Warranty, Box width (imperial)) and buy a liked model rechargeable batteries in one of the reliable online stores.
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Battery for PowerBook G4 15", Grade-3B
Grade 3B means that this battery is in reasonable cosmetic condition but will have some noticeable marks (B). It has a full charge capacity of between 50% and 75% of it's original quoted capacity (3).
This is an original Apple battery for all models of 15" Aluminium PowerBook G4, part number A1045.
This battery has been fully charged, fully discharged and fully charged again before using Apple system profiler to determine the current capacity of the battery. This battery, when new, had a quoted capacity of 4,000mAh.
This is an grade 3-B battery. The 3 refers to the battery capacity and indicates that it currently holds 40% or more of it's original charge, in this case, more than 1,600mAh. The B refers to the cosmetic condition and indicates that although in good condition, this battery will have some moderate scratches or cosmetic blemishes.
Image shown is a stock photo and not of the item being sold.