How long is the battery life on this?

I just want to know how long the battery life is on this because I need a new battery.

Rechargeable Battery - 15-inch MacBook Pro (aluminum)

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  • Best Answer:

    Apple is advertising it as 6-8 hours but everyone is saying 3-4 hours. The problem everyone else is having is that they haven't calibrated the battery. Once you install the new battery, let the battery completely drain (do NOT plug it in), charge it up, and let it fully drain once more. go to Google, search "calibrating macbook pro battery" and its the first link that pops up. That article will tell you how to properly calibrate your battery.

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