Installing New Battery Caused Crazy CPU Consumption (Macbook Pro, Early 2011)

Discussion in 'Mac Basics and Help' started by ihinman, Oct 9, 2014.

  1. ihinman macrumors newbie

    Oct 9, 2014
    So my original battery in my Macbook Pro (MC723LL/A) passed 1000 cycles a few weeks ago, and the battery life has been getting horrible. I ordered a new battery off Amazon (A1386, same as factory). When I installed the battery and booted up, however, the computer was running REALLY slow. I opened Activity Monitor, and kernel_task was using between 200 and 300% CPU, and there were several Google Chrome Helper tasks using huge amounts of memory/CPU as well.

    At first I didn't realize what had happened, and spent quite awhile trying to debug and sort out the problem. Finally out of frustration I switched the old battery back in, and voila, everything was back to normal.

    What could possibly be causing this??

    Before you suggest it, yes I tried PRAM/SMC resets, of course I rebooted the computer numerous times, repaired permissions, ran a full sweep with OnyX, deleted and fresh installed Chrome, etc, etc.
  2. Tumbleweed666, Oct 10, 2014
    Last edited: Oct 11, 2014

    Tumbleweed666 macrumors 68000


    Mar 20, 2009
    Near London, UK.
    I wonder if there is a fault with the battery and it has very low voltage ?

    Have you swapped it back and seen if this repeated or was one-off?

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