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At last we carve out the (mightily adhered) 5-cell battery.
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You'd better hope your "Pro" career is short; this battery replacement is a doozy.
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The battery board hosts a TI BQ20Z451 (a possible variant of the BQ20Z45-R1 line, seen in MacBook Pros forever)
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Listing a 49.2 Wh capacity, this battery seems a little piddly compared to the Function Key edition's 54.5 Wh—especially considering it's driving a lot more functionality (pun intended).
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Dotting our i's, we slap these batteries on a scale: the Function Key-equipped MacBook Pro battery weighed in at 235 grams, while this battery weighs just 197 grams.
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