My Macbook Pro is #A1226. Is this the correct replacement battery? Also, since this is an older laptop, will that somehow affect the battery life?

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    No, you want apple P/N: MA348LL/A. I just got a new one of these yesterday at the Apple store and on the first complete cycle I'm finding a battery life of between 4 and 5 hours. That's running with WiFi and bluetooth on and the display dimmed to 25% (3 ~ 4 dots) and the keyboard illumination off.

    The laptop being older shouldn't affect battery life significantly. Perhaps, if the laptop was used in a dusty environment it might need more energy for cooling but I can't imagine that happening in an normal environment unless the laptop was 10+ years old.

    I can see a new battery from Apple performing better than the original if they've adapted some of the new cell technology that they are using in the later MBP's to the older battery but that's a detail that you couldn't confirm without directly comparing the older and newer batteries.

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