Motherboard battery output test

Hello,
any body know how to test the battery output on a dell inspiron 2650. just replaced the battery and it wont take a charge.
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More about motherboard battery output test
  1. Hi bkw_02 and welcome to THG.

    If u have a multimeter u can use it for test the battery.
  2. saint19 said:
    Hi bkw_02 and welcome to THG.

    If u have a multimeter u can use it for test the battery.


    yes thats what i would like to do but i need the pinouts,
  3. Remove the battery and connect the multimeter the pinouts isn't important since u only get a - when u connect the positive to the negative of the battery.
  4. saint19 said:
    Remove the battery and connect the multimeter the pinouts isn't important since u only get a - when u connect the positive to the negative of the battery.


    thank you,
    there are 7 pins. if there is just a ground and power pin what are the other 5 for?
  5. Doest that pins have a specific color? I think that u can look in the mobo's manual to know which are the corrects for test it.
  6. saint19 said:
    Doest that pins have a specific color? I think that u can look in the mobo's manual to know which are the corrects for test it.


    no colors. its a dell inspiron 2650 laptop
  7. There are often more than one positive and negative terminal. I would jsut take a multimeter and play around until you get something.
  8. The problem is that simply measuring the voltage will not tell you much. I mean, if you charge the battery and you cannot read the full voltage across it, it is almost certainly bad. But without putting a load on the battery, measuring the full output voltage won't tell you much.

    The output voltage will be something less than 20 volts. The input impedance of your typical DMM is 11 Megohms. You will pull something like 1.5 microamps out fo the battery when you try to measure. The battery can be all but graveyard dead and it will still report the full voltage.
  9. jsc said:
    The problem is that simply measuring the voltage will not tell you much. I mean, if you charge the battery and you cannot read the full voltage across it, it is almost certainly bad. But without putting a load on the battery, measuring the full output voltage won't tell you much.

    The output voltage will be something less than 20 volts. The input impedance of your typical DMM is 11 Megohms. You will pull something like 1.5 microamps out fo the battery when you try to measure. The battery can be all but graveyard dead and it will still report the full voltage.

    thanks,
    i want to test voltage coming from motherboard not battery.
    i
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