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Is it dangerous or not advisable to change the UPS battery while it is plugged in? We have an APC Smart-UPS 1500 and we need to replace its battery. I have the new battery but the UPS powers a few machines that I would rather not turn off for the replacement procedure.

Would something bad happen if I just replace it while it's still plugged in and powered on?

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Check the manual. Some UPSes support hot-swap, some don't. – womble Jul 2 '12 at 14:27
@womble - thanks, the manual that was in the replacement battery box did not mention anything about power. The instructions only show how to open the battery compartment etc. That's why I thought the "real" UPS manual would not contain the info as well. Obviously I'm glad to be proven wrong :) – Siim K Jul 2 '12 at 14:45
up vote 22 down vote accepted

According to the manual:

Replacing the Battery Module

This UPS has an easy to replace, hot-swappable battery module. Replacement is a safe procedure, isolated from electrical hazards. You may leave the UPS and connected equipment on for this proce- dure.

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I've hot swapped the batteries on several smartUPS models including the 1500 without any problems. – Rex Jul 2 '12 at 15:25

The Smart-UPS 1500 battery is hot-swappable. You do not need to unplug or power down the UPS before changing the battery.

Of course, it is essential to refer to the product documentation and take all appropriate measures to protect yourself from the shock/electrocution hazards associated with live batteries and charging equipment. Under the right (wrong) circumstances, even a 12-volt lead acid battery can deliver a fatal shock.

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