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[* black] The battery is 60 watt-hours, the same capacity as the 13" MacBook Pro.
[* black] The previous plastic MacBooks featured a 55 watt-hour battery and claimed a 5-hour run time. Apple has added 5 watt-hours of battery capacity and two hours of run time. Either this machine is substantially more efficient than its predecessor, or Apple's new battery life claims are overly optimistic.
[* black] Despite its higher capacity, this new battery is actually lighter than the previous MacBook's battery. This battery boasts a power to weight ratio that's 23.5% better than its predecessor.
[* icon_note] For most repairs, removing the battery is not necessary, you just need to disconnect it from the logic board.