PowerBook Battery

Discussion in 'PowerPC Macs' started by foeniox, Dec 24, 2007.

  1. macrumors newbie

    foeniox

    Joined:
    Dec 24, 2007
    #1
    hi everyone, could do with some help regarding a battery issue im having with my powerbook (G4 15" FW800)

    issue

    Battery wont charge
    Displays charge status - 0%
    Displays charging status - Calculating

    tried

    Resetting NVRAM/PRAM/PMU
    Booting into open firm and resetting nvram and all

    tried finding someway of flashing the battery firmware but i cant find anything

    ideas

    Well the computer initially wouldnt boot even with the power adaptor plugged in.
    Resetting the PMU sorted this but needed to be done everytime the computer was shutdown.
    Soft reboots work fine,

    I've tried with another battery and it works fine, so clearly its a specific battery issue.

    The powerbook understands when there is and isnt a battery (menubar symbol), it reads all the info off the battery (sys profiler) .. it just wont charge it!


    any help much appreciated
     
  2. macrumors 6502a

    Joined:
    Jul 15, 2003
    #2
    Sounds like the battery is toast. I have the same computer. I'm lucky to get 20-30 min.

    There are a couple programs out there that will profile your battery and tell remaining charge and capacity. Do a versiontracker search for battery.
     
  3. thread starter macrumors newbie

    foeniox

    Joined:
    Dec 24, 2007
    #3
    yeah unfortunately the battery im currently using only gives me about 20mins, its the original powerbook battery - the newer one is the not working one


    i had a look before, but i just realised i should compare the specs across the 2 batteries i own.

    Working (Old) Battery Information:

    Charge Information:
    Charge remaining (mAh): 972
    Charging: No
    Full charge capacity (mAh): 974
    Health Information:
    Cycle count: 185
    Battery Installed: Yes
    Amperage (mA): 0
    Voltage (mV): 12384

    Broken (New) Battery Information:

    Charge Information:
    Charge remaining (mAh): 0
    Charging: No
    Full charge capacity (mAh): 1806
    Health Information:
    Cycle count: 210
    Battery Installed: Yes
    Amperage (mA): 0
    Voltage (mV): 9434


    note the working battery is a good 2 years older than the broken battery, i dont understand why a newer battery with a still higher capacity doesnt work.

    is it something to do with the voltage? im kind of curious as to why thats dropped so far ...


    thanks for any help on this guys, this has got me confused, do batteries just drop out and die? i was under the impression they progressively lost capacity untill they were essentially useless ...
     

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