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Thank you for responses. It is about 3 years old. Replacing may be the best way, but you know about what they say about "fools rushing in", the battery is about $80, and I figured this old man might learn something. I charged it last spring when I had the problem and it was charged up to 4 bar or full capacity. It is now half capacity but a little over 37 Volts. I'm guessing it was very little more at full charge since 5 cells X 7.2 Volts = 36 Volts. Checking was done with a Fluke DVM that was calibrated while I was still working. If it had measured 34 Volts or so, I would have thought a weak cell and disposed of the battery.
I have not load tested. I have a good battery. Newark and Mouser have reasonable priced high watt resistors that I could put inline between the battery and probably my little weedeater to get voltage drop and figure out the current. Jumping whatever this component is I could compare the bad battery to the good and check the cells with an infared thermometer to find out if one is a lot different.
Thank you to everybody for sharing your knowledge.
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drew1
wife has 924 turbo
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