Re: Lead acid battery tester

In article <d2k1dlxcgk.ln2@Telcontar.valinor>, robin_listas@es.invalid
says...

 
Hi,
 
I bought yesterday a battery for my UPS at a shop that specializes in
batteries. I had my old battery there, so to get the same type, and I
asked the chap if he had a voltage meter. Something like that, he said.
He brought out a special meter with huge clamps, attached it, and said
the batter had 13.6 volts. Then he tested "load" and said said the
battery gave out only 20 out of 100. I don't know what he was actually
measuring, some time of current over a resistor measurement, I suppose.
It is adjusted for the size of battery.
 
Do you know what meter could be that thing?
 
--
Cheers, Carlos.
 
 
 

If that was a 12.5 volt battery (6 cell) his meter should not show 13.6
volts if it was correct .  However the testers will put a heavy load on
the battery and it should not drop but maybe 2 to 4 volts depending on
the tester and the load it puts on the battery..  The less the better. 
If it drops more than that the battery is on its way to going bad. 
Simple volt meters tell almost nothing about a battery.  They often have
the rated voltage without a load. They must be put under a load.  The
more the voltage drops for the same type of battery the worse it is.