My battery has done 304 cycles. I've not noticed any drop in performance, but today full charge capacity (mAh) suddenly = 0. Do I need a new battery?

Rechargeable Battery - 13-inch MacBook (Black)

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  • Best Answer:

    This happened to me yesterday. I had 254 cycles on it and ...boom.. it is now not charging with a full charge capacity (mAh) = 0. I tried re-setting the SMC and that did not help. I took it in to the Genius bar and he connected an iPod-based testing device to it and sure enough it is 'dead' and needs to be replaced. Apple only warrants the battery for 1 year or 300 cycles whichever comes first. So, try re-setting the SMC (shut down computer, remove the power plug, remove battery, press the power button and keep it pressed down for no less than 5 seconds, re-insert the battery, connect the power plug and restart your computer). If that does not work, take the laptop to the Apple Store for confirmation that it is dead and if it is, buy yourself a new battery. Needless to say, I am not an Apple Genius.. so all this is at your own risk. I am now looking for a 3rd party to sell me a genuine Apple battery for hopefully tens of pounds less than what Apple sells it for.

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  • That was the case with my first one too. Apple replaced that battery for free.
    The replacement battery has done 667 cycles so far. No problems yet.

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