On Jul 10, 1:46*pm, John Robertson wrote:
SparkyGuy wrote:
Gell-cell batteries in UPS's: other than loading with a known load and timing
how long it takes to drain the battery, is there a simple way to measure the
health of a gel-cell? Impedance?

Thanks,
S.

How about ESR? Bob Parker's Blue ESR meter will give you some static
clues as to the condition of batteries if compared to known good ones...

http://www.flippers.com/esrkthnt.html(near the bottom of the page)

John :-#)#

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If you put an ESR meter accross batteries you will blow the meter!!!
ESR is to be measured with no active voltage!