Could a MacBook Pro Retina really run 6 hours on 3 AA batteries?

Discussion in 'MacBook Pro' started by Nicklaus, Jul 17, 2012.

  1. Nicklaus macrumors 6502

    Nicklaus

    Joined:
    Jun 19, 2010
    Location:
    Winter Park
    #1
    Using iStats my mac battery shows a design capacity of 8460 mAh I have rechargeable AA batteries that say they are 2500 mAh. So is it equivalent to a little more that three AA batteries? It can't be possible these are the same thing right? Are laptops that efficient now? :confused:
     
  2. leecbaker macrumors newbie

    Joined:
    Apr 7, 2012
    Location:
    New Zealand
    #2
    Laptop batteries are higher voltage, and so at the same mAh rating, store more power. Best to compare watt-hour ratings. Your AAs stay around 1.3-1.4 volts, and the MBPR is rated at 11.2 volts (95Wh divided by 8.46Ah). The AAs would be somewhere around 3Wh.
     
  3. brand macrumors 601

    brand

    Joined:
    Oct 3, 2006
    Location:
    127.0.0.1
    #3
    Check the voltage of your AA batteries against the MBPR.

    [EDIT]Dang beat me to it.
     
  4. Nicklaus thread starter macrumors 6502

    Nicklaus

    Joined:
    Jun 19, 2010
    Location:
    Winter Park
    #4
    Nice explanation! I knew I must be missing something. :D
     
  5. ryane67 macrumors member

    Joined:
    Jun 13, 2012
    #5
    mAh is is the amount of time the battery will work given a constant current draw at it's given voltate (typically 1.2v for a rechargable AA).

    power consumption is actually measured in watts, which is amps (or in this case milliamps) multiplied by the voltage necessary to run the devices.

    In order to power the rMBP with your AA's you'd need 10 batteries in series to get to the required 12v, but they would only have a charge time of 2500mAh, so you'd need three and a half groups(in parallel) of ten(in series) to get about the same capacity of the built in battery.
     

Share This Page