Quick answer
- Ensure the battery is warm enough to charge; lithium-ion batteries won't charge below ~32°F (0°C).
- Watch the charger LEDs: on Ryobi 18V ONE+ chargers, a flashing green LED means the battery is charging and a steady green LED means the charge is complete. A flashing red LED typically means the battery is too hot or too cold.
- Inspect the battery for swelling or damage. A compromised battery should not be used.
- Try a different charger if available, as the charger may be faulty.
Symptoms
When a Ryobi battery won't charge, you'll usually see it in the charger's LEDs. On a Ryobi 18V ONE+ single-port charger (common SKUs include P117, P118/P118B, and P119), a steady red LED means the charger is powered and ready, a flashing green LED indicates the battery is charging, and a steady green LED indicates a full charge. A flashing red LED usually signals a temperature delay — the pack is too hot or too cold to charge safely. You may also notice the battery won't power your tools, or that the charger cycles without ever reaching a full (solid green) state.
Quick checks
Before diving into deeper troubleshooting, perform these quick checks:
- Temperature Check: Ensure the battery is at a safe operating temperature. If it's cold (below ~32°F), allow it to warm up.
- Charger Functionality: Confirm the charger is working by testing it with a different battery, if available.
- Battery Condition: Inspect the battery for any visible damage, such as swelling or corrosion.
- Connection Integrity: Make sure the battery contacts and charger pins are clean and free of debris.
- Compatibility: Verify that you're using the correct Ryobi charger for your battery model.
Step-by-step fix
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Remove the Battery: Always disconnect the battery from the tool before performing any troubleshooting. This ensures safety while inspecting the battery.
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Check the Charger: Plug the charger into a known-good outlet. On Ryobi 18V ONE+ chargers, a simultaneous flashing red and green LED typically indicates a defective battery or charger — if you see that pattern consistently with known-good batteries, the charger likely needs to be replaced. When in doubt, consult the printed LED legend on the charger body or the owner's manual.
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Inspect the Battery: Look for any signs of swelling, punctures, or corrosion. If the battery is compromised, it should be recycled properly.
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Warm the Battery: If the battery is cold, bring it to room temperature (above 32°F) before attempting to charge it again. This step is crucial as lithium-ion batteries have a built-in safety mechanism that prevents charging in cold conditions.
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Reconnect and Charge: Place the battery back into the charger and watch the LEDs. A flashing green LED means it's charging; a steady green LED means it's full. If the LED flashes red, wait for the battery to reach a suitable temperature before trying again.
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Test the Battery: After charging, test the battery in a tool to ensure it's functioning correctly. If it still doesn't work, consider the next steps.
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View Ryobi 18V ONE+ HP 4.0Ah Battery (PBP004) on Home Depot (paid link)
If it still isn't working
If the battery still fails to charge after these steps, you may need to escalate the issue. Check the warranty status of your battery. Ryobi offers a 3-year warranty on their 18V ONE+ batteries, so if it's within this period, consider contacting Ryobi customer service for a replacement. Alternatively, take the battery to an authorized service center for further diagnosis.
FAQ
What should I do if my Ryobi battery is swollen?
Swollen batteries are a safety hazard and should not be used. Dispose of the battery at a recycling center like Home Depot or Lowe's.
Why does my charger show a red blinking light?
On Ryobi 18V ONE+ chargers, a flashing red LED typically indicates that the battery is too hot or too cold. Allow the battery to reach a safe temperature and try again. If you see red and green flashing together, that usually points to a defective battery or charger.
Can I use a different brand charger for my Ryobi battery?
Ryobi recommends using Ryobi-authorized chargers with ONE+ batteries. The concern with third-party chargers isn't simply voltage — it's that the charge profile and battery-management communication may not match what the pack expects, which can lead to incomplete charging or damage over time. Stick with a Ryobi ONE+ charger for reliable results.
How can I tell if my charger is faulty?
Test the charger with another compatible battery. If it charges the second battery, your original battery may be the issue. If it doesn't charge the second battery either, the charger may need replacement.
What is the warranty on Ryobi batteries?
Ryobi offers a 3-year warranty on their 18V ONE+ batteries, covering defects in materials and workmanship.