UPS Replace Battery Light Still On After New Battery

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Quick answer

A fresh battery doesn't turn the Replace Battery light off by itself. The light only clears after the UPS passes a self-test, and APC says that test needs a fully charged battery. If you run it straight after the swap, a good new battery can still fail. This question comes up often on Schneider Electric's own user forum.

Make sure the cartridge matches the UPS model before you start troubleshooting.

APC RBC Selector APC RBC17 APC APCRBC154 APC APCRBC124

Back-UPS: clear the light in four steps (APC's steps)

Confirm the battery is connected. APC's first step is to check that the internal battery is plugged in. Your user manual shows how.
Check the load. Remove anything that overloads the battery outlets. APC suggests only computers and monitors on battery outlets. If the UPS is near full load (over 80% of the battery outlets' watt capacity), don't use it as a master switch for your equipment.
Let it charge. Disconnect any external battery pack. APC says to run the self-test with the UPS fully charged, which means 5 hours of charging without a switch to battery, with your normal load attached.
Run the manual self-test. With the UPS plugged into the wall, hold the On/Off button for about 4 seconds until you hear a long tone. The yellow On Battery light comes on and the green On-Line light flashes for about 15 seconds.

Result after the self-test	What APC says it means
Replace Battery light turns off	The battery does not need replacing.
Light stays on and the unit chirps for a full minute	The battery failed the test and should be replaced.

Smart-UPS: longer charge, different button

For Smart-UPS and Smart-UPS Online, APC says to charge to 100% with the normal load connected. That means at least 8 hours for a standard unit, or 24 hours with external battery packs. Smart-UPS units charge whether they are on or off, as long as they are plugged into good power. Then start a self-test from the LCD menu (Test & Diags → UPS Self Test). On units without a screen, press and hold I/Test until the lights flash. If the Replace Battery light stays lit after that, APC says the battery needs replacing.

If a brand-new battery still fails

Check the cartridge number. Use the UPS model from the sticker on the bottom or rear, not the old battery's label. APC's selector warns against searching by battery number.
Use the warranty. APC says the Back-UPS comes with a 2-year warranty that includes the battery. Smart-UPS batteries are covered for 2 years from purchase. Genuine RBCs carry their own two-year warranty for lead-acid batteries. Within those windows, contact APC Support with the part and serial numbers.

How we work: the charge times, button presses and results on this page come from APC by Schneider Electric's Back-UPS and Smart-UPS support articles. Sources are listed below.

Questions people ask

Why is the replace battery light still on after I put in a new battery?

The light only clears after the UPS passes a self-test, and APC says the test needs a fully charged battery. Run it straight after the swap and a good new battery can still fail.

How do I run a self-test on an APC Back-UPS?

After about 5 hours of charging, keep the UPS plugged in and hold the On/Off button for about 4 seconds until you hear a long tone. APC says the yellow On Battery light comes on and the green On-Line light flashes for about 15 seconds.

What if a brand-new battery still fails the self-test?

Check that the cartridge matches your UPS model from the sticker, not the old battery's label. APC says the Back-UPS 2-year warranty includes the battery.

Sources

Last checked Oct 23, 2026. UPS batteries are heavy lead-acid or lithium cells. Follow your UPS manual when swapping them, and recycle the old battery. APC says some models are not user-replaceable.

Replace Battery light still on after a new UPS battery? Run the self-test