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If nothing else, use a coupe alkaline cells for a check, usually if the
low range is good the rest is just multipliers.
I just did some lawn mowing (not good, too hot)
, checked the JD-90 pack before at 38.7 volts, about an hour of heavy
grass, checked at 37.4 unloaded both times. Charger is putting about 18
amps into it now.