I didn't know that UL doesn't list batteries......
From lithonia:
You can use anyones battery in the above unit, as long as it meets or exceeds the spec's of the original. Because of charging currents and such, lithonia can not guarentee that the lights would run for their expected time with another manufacturers battery if this replacement battery does not meet the origninal specs that the unit was produced for.
Because the unit was produced to meet UL listings for 90 minutes of emergency lighting, using a different battery that does not meet the specs of the original, there is no way for Lithonia to guarentee 90 min. It may only run for 10 minutes with a smaller battery. This is why the UL listing would be voided.
In a way it makes sense..
Dnk...