Is it time for a new battery?

Discussion in 'MacBook Pro' started by WCunha, Jul 7, 2008.

  1. WCunha macrumors member

    Feb 15, 2007
    I have a 15" MacBook Pro that I bought new in 1/06. The battery status will show that I have about an hour left on the charge and then it just shuts off. It doesn't sleep it like pulling the plug on a desktop.

    Istat Pro says the battery health is 60%.

    Does it sound like I need a new battery or could it be something else?

    Thanks, Wade
  2. ben.mcmahan macrumors member

    May 6, 2008
    in apple menu-
    ->about this mac
    ->more info

    should be information that looks like this

    Full Charge Capacity (mAh): 3749
    Remaining Capacity (mAh): 3621
    Amperage (mA): 271
    Voltage (mV): 12588
    Cycle Count: 172

    full charge (on a new ibook is 4400, iirc), so i have a decent charge left...
    cycle count, when it hits 300, batteries start to go down hill (according to apple)...

    both numbers should give you sense, but my laptop batteries seem to last 1.5 years or so, under heavy (ab)use, so if you're pushing 2.5 years, not bad, not bad at all.
  3. WCunha thread starter macrumors member

    Feb 15, 2007
    This is what mine looks like...

    Full Charge Capacity (mAh): 3350
    Remaining Capacity (mAh): 2977
    Amperage (mA): 830
    Voltage (mV): 12524
    Cycle Count: 293
  4. ben.mcmahan macrumors member

    May 6, 2008
  5. WCunha thread starter macrumors member

    Feb 15, 2007
    Thanks for all the info it is appreciated.

    Is 2.5 years good for any laptop battery?
  6. snaky69 macrumors 603

    Mar 14, 2008
    Yes. Lithium-Ion batteries degrade after one year regardless of use, and degrade a little bit with each charge cycle, so 2.5 years is decent.

    I'd perform a calibration if you can, this may help with the random shutting off.
  7. merl1n macrumors 65816


    Mar 30, 2008
    New Jersey, USA
    I agree. Just re-calibrate your battery per this article:

    After the "rest" period, I would also suggest an SMC reset before you boot up.

  8. Tennyo macrumors member


    May 10, 2008
    I have a slightly similar problem. I got my MacBook Pro sometime in the early spring of 2007, so my battery should still be fine, right? However when the battery starts getting low my laptop has stopped warning me that it is running on reserve power and needs to be plugged in.

    Also, if I let the battery die, my laptop would simply go into sleep mode, but now it just shuts off without warning, almost as soon as the battery gauge turns red, and sometimes while it's still black.

    Here are what my power settings say:

    Battery Information:

    Battery Installed: Yes
    First low level warning: No
    Full Charge Capacity (mAh): 4242
    Remaining Capacity (mAh): 4074
    Amperage (mA): 198
    Voltage (mV): 12619
    Cycle Count: 322

    I currently have it plugged in, if that means anything.

    I've always tried really hard to not let the battery die, but it has happened. I just don't think I can afford to be without my laptop for however long it would take for this to be fixed. :/

    Also, I went studying abroad in Berlin this past fall. The battery problems didn't start until after I got back and just steadily got worse until the point I'm at now where the thing just shuts off. Do you think the voltage difference could have had damaged my battery?

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