...how it works and 
The MacBook Pro 15" battery is a 60 watt/hour lithium-polymer module that's rated at up to 4.5 hours of performance, depending on settings and usage. It's pretty durable but if you need to replace it, it's just a matter of switching out the old for the new. For longer life it's advisable to 'condition' your battery every now and then. See Apple for details.
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Battery for Apple MacBook Pro 15" Inch A1175 MA348G/A $41.08 
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New 6 cells 56WH Battery fo Apple MacBook Pro 15" A1175 $39.19
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for MacBook Pro 15" inch Rechargeable Battery A1175 $29.95
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Tags: battery, macbook, macbook pro, MacBook pro 15
