can you overcharge a macbook battery

Discussion in 'MacBook Pro' started by tim2006, May 27, 2007.

  1. psychofreak Retired

    psychofreak

    Joined:
    May 16, 2006
    Location:
    London
    #2
    I don't get it, explain exactly what you mean by 'overcharging' please :)
     
  2. warfa macrumors regular

    Joined:
    Apr 12, 2007
    Location:
    SD
    #3
    maybe he means if you leave it plugged in for a couple of days:eek:

    it will know when to stop charging:D
     
  3. M@lew macrumors 68000

    M@lew

    Joined:
    Nov 18, 2006
    Location:
    Melbourne, Australia
    #4
    Nope I'm pretty sure you can't as Macbook's stop charging after a certain point and let the battery drain to help save the batteries life.
     
  4. RCElectricFlyer macrumors member

    Joined:
    May 5, 2007
    #5
    The battery management hardware/firmware takes care of the Li-Ion batteries. To extend life, the algorithm won't continue to charge the batteries after they are fully charged. Instead, it lets the batteries back down to maybe 96% SOC (State Of Charge) before charging again.

    The charge algorithm is basicly CC-CV - Constant Current-Constant Voltage. The batteries charge at a constant current until they reach a certain voltage (around 4.1V/Cell). Then the current tapers down to maintain this voltage (constant voltage) until they are fully charged. An "Electronic Fuel Gauge" gathers data from the performance of the battery in an attempt to accurately estimate the SOC and thus the remaining charge/runtime.

    Rob
     

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