Hi all,
A couple of months ago I bought a new lead acid AGM motorcycle battery.
Even after fully charging it from the mains, it wouldn't start the bike more than a few times. Today I've tested it by fully charging, then discharging at a constant 3.0A into an electronic load. It lasted just over 1 hr before the terminal voltage fell below 10.0V, meaning a useful capacity of ~3Ah instead of the rated 12Ah.
I'm inclined to simply send it back, but I'm curious as to what the fault might be, and whether it can be easily fixed. Does anyone know anything about manufacturing faults with this type of battery?
Also, does anyone know what a garage "battery test" actually consists of, and whether it's likely to show up a problem?