A Smart-UPS that has a dead battery or doesn’t have a battery will not turn on. If you’ve stored your unit for a few years and when you brought it back out it didn’t turn on, most likely the battery died but the unit is functional. If you removed the battery from your UPS or bought one without a battery, it also won’t turn on.
UPS batteries don’t have a long shelf life when they’re being stored, six months to a year is enough to completely drain the battery and make it unusable. A Smart-UPS requires a specific minimum voltage to recognize that there is a battery installed, and if it doesn’t see it, it’s as if the battery is not there at all.
The quickest way to test the unit to make sure it’s working is to try a good working battery from another unit. If the UPS turns on with the good battery, your issue was just a dead battery.
The newest APC units (SMX/SMT) will power up with a dead battery, all the other ones require a working battery in order to turn on.
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