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I have a Battery Tender Plus brand charger that is about 12 years old, and I'm not sure that the charging circuit is correctly functioning. I plugged in the B.T. into each of our four motorcycles yesterday (all in an unheated garage, at about +8 F) and none of them seemed to need any charging, despite the fact that they have been sitting at least 6 weeks since last getting plugged in to the charger. The red and green lights on the B.T. still work, and go almost immediately from red to green. Battery voltages measured at the standard SAE pigtail showed from 12.39 volts to about 13.2 volts, depending on which of the motorcycles I checked. Three of the four batteries are "sealed" type, and the 07 FJR is the newest of the batch. In November, the non-sealed battery stayed "red" [charging] for a few hours; the other three didn't need any charging (based on the red-green status lights). Given how cold it is and has been (negative teens F for a week or so), I would think that a bit of charge would be needed by the batteries.
Is there any good test procedure(s) that I can do to determine whether the B.T. is still working correctly, short of buying another one to check whether the results are the same?
Thanks in advance for your collective wisdom.
Is there any good test procedure(s) that I can do to determine whether the B.T. is still working correctly, short of buying another one to check whether the results are the same?
Thanks in advance for your collective wisdom.