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Powerbook battery and the terminal voltages

Message #1 - Posted 2003/11/30 - Mark Evans

Hi there,

I have a PowerBook G3 of the Wallstreet type. The battery doesn't hold charge at all. The cost of a brand new battery is a bit steep so I thought I would break into the case and check each of the individual cells to see if one had failed etc.

Having got in I find that all the cells appear good and seem to hold charge OK, deliverying 16V+ accross the cells, even under a load I put on the cells. Note this is tapping into the two connectors on the PCB that deliver the power from the cells.

However accross the terminals that connect to the PowerBook the voltage is about 0.5V. Now this doesn't seem right to me.

Can anyone tell me what the voltage on the terminals should be and possibly why there is this discrepancy?

<rant> Why don't Apple et al have batteries that allow you to replace cells easily!
</rant>

Cheers in advance.

Best regards,
Mark
Hull, UK

Message #2 - Posted 2003/12/05 - Phil Taylor

Previously, Mark Evans wrote:

Hi there,

I have a PowerBook G3 of the Wallstreet type. The battery doesn't hold charge at all. The cost of a brand new battery is a bit steep so I thought I would break into the case and check each of the individual cells to see if one had failed etc.

Having got in I find that all the cells appear good and seem to hold charge OK, deliverying 16V+ accross the cells, even under a load I put on the cells. Note this is tapping into the two connectors on the PCB that deliver the power from the cells.

However accross the terminals that connect to the PowerBook the voltage is about 0.5V. Now this doesn't seem right to me.

Can anyone tell me what the voltage on the terminals should be and possibly why there is this discrepancy?

<rant> Why don't Apple et al have batteries that allow you to replace cells easily!
</rant>

Do you have (and have you used) PowerBook G3 Battery Reset? Always the first port of call for battery problems on this machine...

Phil Taylor

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