Battery bypass?

Discussion in 'Mac Apps and Mac App Store' started by Chef Medeski, Sep 17, 2005.

  1. Chef Medeski macrumors 6502a

    Chef Medeski

    Joined:
    Jun 14, 2005
    Location:
    New York, NY
    #1
    I know that once the battery is charged to 95%, my Pb will automatically bypass the battery and run straight of A/C power. I was wondering if there were any software programs that could do this at a smaller percentage. I find that sometimes I just want to not use the battery without taking it out (I think it would help with Battery performance).
     
  2. yg17 macrumors G5

    yg17

    Joined:
    Aug 1, 2004
    Location:
    St. Louis, MO
    #2
    I believe as long as the laptop is plugged in, it will run off AC power. Otherwise, charging wouldnt be too efficent if it was pulling power from the battery at the same time it was being charged.
     
  3. Makosuke macrumors 603

    Joined:
    Aug 15, 2001
    Location:
    The Cool Part of CA, USA
    #3
    I really don't think it's going to make any difference; remember that modern Lithium Ion battery life is basically based on the number of charge-discharge cycles, which will be the same regardless of how you run--what goes down must go up. In fact, taking the battery out and letting it self-discharge over a period of time instead of float-charging it is going to add charge-discharge cycles, reducing battery life.

    Besides, if the PBs work like most similar systems, the DC adapter is probably floating the system power bus when it's plugged in, so you're not exactly "running off the battery", but running in parallel to it so there is no distinction--the power is coming from the adapter either way. The only distinction is made by the battery's internal charge controller to limit incoming current when the battery nears full.

    There's no such thing as charging a battery and running off of it at the same time--you have a bus at a given voltage, and power will come from where it can come from. If the current being supplied by the wall adapter is higher than the demand of the system (which it is, or the battery couldn't charge while you were running), then current will flow into the battery, period. If the current coming from the adapter at that voltage were less than the system demand, the battery would pick up the slack--that's the definition of a battery. But unless your power adapter is malfunctioning, that's not going to happen, so you can safely leave the thing plugged in and let it do its thing.
     
  4. Chef Medeski thread starter macrumors 6502a

    Chef Medeski

    Joined:
    Jun 14, 2005
    Location:
    New York, NY
    #4
    How about this, is there anyway to not charge a battery while its in the computer?
    That was the original question.

    Because the shortens the number of charge-discharge cycles. And since I have noticed the topping the battery off takes alot longer than the inital phase. I'm basically hypothezing and have some support that it is better to fully drain a battery and then charge it, than ot half way drian, charge fully, half way drain.
     
  5. Chef Medeski thread starter macrumors 6502a

    Chef Medeski

    Joined:
    Jun 14, 2005
    Location:
    New York, NY

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