How to test a sealed lead-acid rechargable battery

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.
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SantiagoAAsked:
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mquirozCommented:
there's an endless debate between a DC load test vs. conductance AC testing, but there are also standars like IEEE 1188

for the plain mortal like us if the voltage of the battery is zero the battery is dead beyond recue.
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