I have a couple of 12V 7.5AH lead acid gel cell rechargeable batteries
that were installed in series in a 24V fire alarm panel. After just
slightly over a year the panel suddenly started beeping a low battery
signal. I pulled both batteries out replaced them and the problem was
resolved. I took both old batteries back to the shop and charged them
individually at 100ma. for a few days. They both came up to over 14V.
After sitting overnight without charging hey both remained just under
13V. So now I would like to load test them to see which one is falling
down on the job. Does anyone know what the proper load would be to do
this and also the minimum terminal voltage I should expect to read on a
fully charged battery while the battery is loaded in such a way? Is
there a specification for how long the load should be connected before
you read the voltage and ultimately assess the quality of the battery?
Thanks very much, Lenny Stein, Barlen Electronics.