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Released October 2008 / 2.4, 2.53, 2.66, 2.8 or 2.93 GHz Core 2 Duo Processor

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Purchased new battery; how long should it last?

This 2008/2009 MacBook has had endless issues since purchase with charging/staying charged. Battery tests have always indicated that it was fine. Borrowed a new charger and that seemed to help though we got to where we only ran it off the charger.

This computer has always had light use; mostly for projecting Powerpoints.

Recently tried to use it for other applications and it would suddenly quit (black screen) while on battery or if I unplugged the charger despite saying it was charged. At one point, it dropped from 60% to 0% in an instant. I tried a battery reset and it didn't help.

I decided it was time to try a new battery so I ordered one via ifixit. I have fully charged it and I am now running it to discharge it so that I can recharge it again, as suggested for "priming" the battery.

The % fell pretty quickly from 98% to 65%. (Yes, I have checked what is running in the system, the brightness, etc.)

I still need to figure out if the issue really is the battery. My question is, about how long should I expect the computer to run under light use with the new battery?

Answered! View the answer I have this problem too

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2 Answers

Chosen Solution

It’s not exactly a low power consumption machine, expect 3/4 hours on normal use but don’t be surprised if you don’t reach 2 hrs watching youtube videos. However percentage drops such as the one you mentioned are not normal under any circumastance..faulty battery or faulty charging circuit are to be taken into account.

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Let’s do some testing of the battery. Complete the guide below; upload 2 screenshots of the coconutBattery window, one with the charger connected and one with the charger disconnected.

How to Test a Mac Laptop's Battery

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