How to test a sealed lead-acid rechargable battery
Posted on 2010-08-25
Is there a way to test sealed lead-acid rechargable batteries (like the ones inside most UPS).
I have a lot of APC UPS, all of them shows no red light, but if I unplug the cord for a hot-test, some of the UPS shuts down inmediatly (with no load at all), and others last few minutes, and others for hours.
Is there a way to test a battery to know for sure if they current charging potential? 100%, 80%, 50%, 20%, dead.