You can full charge to 100% and drain to 1% 2 times. These batteries and chargers are made specifically for the 1st generation of 17' MacBook Pro A1297 models made between 2009-2010. for this battery, we suggest that you can full change it by AC power adapter, because takes a long period, the capacity was strain out by inner PCB circuit, in order to protect your battery life. Get improved performance and longer battery life with Apple MacBook Pro 17' 1st generation A1297 batteries and chargers from Laptop Battery Express. Compatible No.: Apple MacBook Pro 15.4 15-inch This is the internal battery for the MacBook Pro 15' Mid 2009 and Mid 2010 models, but this battery was originally shipped in the mid 2009 model, with the lower 73Wh capacity.
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