The MacBook Air battery is an itegrated 37 watt/hour lithium-polymer module that's rated up to 5 hours of performance, depending on settings and usage. It's pretty durable but if you need to replace it, it's not as easy to do as with other MacBook models. It's necessary to open the case to effect the changeover so if you DIY, take your time.
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Tags: battery, case, macbook, MacBook Air
...how it works and 
