Light meaning and fix
APC Back-UPS Yellow On Battery Light: Meaning and Fix
On APC Back-UPS guidance, a solid yellow On Battery LED means the UPS is operating on battery power.
On APC Back-UPS guidance, a solid yellow On Battery LED means the UPS is operating on battery power.
What it means
The UPS is not using normal utility power and is supplying connected equipment from its battery.
Device details
| Device type | UPS battery backup |
|---|---|
| Brand | APC |
| Model | Back-UPS LEDs |
| Light name | Yellow On Battery LED |
| Light location | UPS front panel |
| Color | Yellow |
| Pattern | Solid |
| Severity | caution |
| Last verified | 2026-05-02 |
What to do first
Save work, shut down safely if needed, and wait for normal power to return.
- Save open files on connected computers.
- Prepare to shut down if the outage continues.
- Check whether the wall outlet has power.
- Do not overload the UPS while on battery.
- Wait for normal power to return.
- Recharge the UPS battery after power returns.
When this can be normal
This is normal during a power outage or unsafe utility power condition.
When to stop troubleshooting
Stop relying on runtime if the battery is near exhaustion. Shut down connected equipment safely.
Parts or products that may help
Only replace parts when the light pattern and official guidance support it. Some lights indicate setup or software states, not broken hardware.
- No replacement part is recommended from this light pattern alone. Troubleshoot the device state first.
FAQ
What does yellow On Battery mean?
Schneider Electric says the UPS is operating on battery power.
Should I save my work?
Yes. Battery runtime is limited.
Does this mean the UPS is broken?
Not necessarily. It can be normal during a power outage or unsafe wall power.
This guide is based on: Schneider Electric APC Back-UPS LED FAQ.
Source type: official_support_page. Confidence: verified. Last verified: 2026-05-02.
UPS runtime is limited and depends on battery condition and connected load.