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Model A1297 Unibody: Early 2009, Mid 2009, Mid 2010, Early 2011 & Late 2011

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After battery replacement random shutdowns on battery power only

I ordered & installed a replacement battery for my mid-2010 17” MacBook Pro. I tried to calibrate it per the iFixit instructions, but when I was trying to run down the battery, the computer shut down for no reason at about 80% battery. After I plugged it into a power supply I was able to start it again and it still showed 80% battery and then I let it sit overnight to die for the battery calibration (I did not keep an eye on it so I don’t know at which point it crashed, and I let it charge in the morning for several hours before using it again).

In short, this has continued to happen intermittently when I am not plugged into a power supply. The computer will randomly shut down when there is plenty of battery power left and it still shows as having plenty of battery left after I reboot. I had no issues like this before replacing the batter — the old battery did not hold a charge for long but it also did not shut down randomly.

Things I have tried:

-Resetting SMC

-Resetting PRAM

-Running Apple Hardware Test (results normal)

In System Profiler the battery status shows as “Normal”.

Is there anything else I can do? Is my battery just a lemon? Can I get a refund? If I have to be plugged into power for the computer not to crash, I’m no better off than I was before. I am a musician and I use this laptop in live performance so I cannot have it randomly crashing.

Thanks

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It sounds like a simple faulty battery but if you download Coconut Battery and post a couple of screenshots with data measured with and without charger we might get a better picture of battery status. In any case iFixit has a very good aftersales service and you won’t have any trouble getting the battery replaced if faulty. You may start from here if you wish so: https://help.ifixit.com/

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I have had the same issue, also with a mid 2010 17” MBP. iFixIt has sent me 3 batteries and they all do the same thing. The first 2 had issues on the initial discharge where they would drop 20%+ at a time. The third one calibrated well but when I was testing it the random shutdowns started again. I have reset the SMC and PRAM. I have noticed that the shutdowns are more likely to happen when the wattage draw is higher, say 45Wh+.

This battery is rated to 95Wh. These batteries are labeled 7.2V and the MBP stock battery is labeled 7.3V. The mAh capacity of these packs based on whats printed; 7.2V, 95Wh should be 13,194 yet all 3 packs showed up at 14,000+ in coconut battery (Wh = Ah x V). One was even 15,000mAh, so something seems to be off.

Either way it’s a bummer because I was really looking forward to having a new battery in my MBP. I will say that iFixIt’s customer service has been excellent and they have been very accommodating.

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M.O. Abbot sarà eternamente grato.
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