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Target voltages for batteries

  • 31-10-2009 11:11am
    #1
    sliabh
    Registered Users, Registered Users 2 Posts: 2,011 ✭✭✭


    Rather than go by charging time, I want to use a voltmeter to check when my batteries are fully charged. Does anyone know what the target voltages should be for an 8.4V (seven cell, 1250mAh), and a 7.2V (TM six cell, 500mAh)?


Comments

  • #2
    extremetaz
    Registered Users, Registered Users 2 Posts: 1,391 ✭✭✭extremetaz


    sliabh wrote: »
    Rather than go by charging time, I want to use a voltmeter to check when my batteries are fully charged. Does anyone know what the target voltages should be for an 8.4V (seven cell, 1250mAh), and a 7.2V (TM six cell, 500mAh)?

    If you want to be really specific about the charge then it depends on whether they are Ni-Mh or Ni-Cad.

    General guideline is that a fully charged cell should be about 1.5-1.6V - so your seven cell would be fully charged at roughly 9.8-10.5V and the six cell should have about 8.4-9V. Capacity is irrelevent if you're gauging charge state off voltage.

    Honestly though, best way to charge them is just a good old fashioned timed trickle charger. If it makes you feel better, you can discharge them first using an appropriate zener diode and a 9v bulb.


  • #3
    sliabh
    Registered Users, Registered Users 2 Posts: 2,011 ✭✭✭sliabh


    extremetaz wrote: »
    If you want to be really specific about the charge then it depends on whether they are Ni-Mh or Ni-Cad.

    General guideline is that a fully charged cell should be about 1.5-1.6V - so your seven cell would be fully charged at roughly 9.8-10.5V and the six cell should have about 8.4-9V. Capacity is irrelevent if you're gauging charge state off voltage.

    Honestly though, best way to charge them is just a good old fashioned timed trickle charger. If it makes you feel better, you can discharge them first using an appropriate zener diode and a 9v bulb.
    Thanks for that.


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