Testing AGM batteries?
When I got my last set of batteries (150aH AGM, used), they had been tested on a high-amp car tester. But my friend who knows batteries pretty well said that was not a proper test, that what we shoul...
Forum Discussion
You need a known resistive load like ganged resistors, i.e. one that has been measured. For a 150AH battery, a 20 A load would be good. The load is connected and with timed duration. The battery is then measured for voltage, which indicates SOC.
I don't know how you'll be able to do this at a battery reseller's shop. They are probably not going to allow it. Your choice would then be to buy one, test it and then purchase more. I think most purchasers take the word of the seller but there would be nothing wrong with checking voltage before purchase. A higher DC voltage would indicate that the batteries have been treated well.
FWIW, I am using three small AGM telecom back-up batteries that were pulled for scheduled replacement. They work just as advertized.
I don't know how you'll be able to do this at a battery reseller's shop. They are probably not going to allow it. Your choice would then be to buy one, test it and then purchase more. I think most purchasers take the word of the seller but there would be nothing wrong with checking voltage before purchase. A higher DC voltage would indicate that the batteries have been treated well.
FWIW, I am using three small AGM telecom back-up batteries that were pulled for scheduled replacement. They work just as advertized.
