Uploaded February 2025 | Updated September 2026, 3 weeks ago

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If your FLEXiO 3550 battery powered sprayer is blinking red on the charger, it means the battery isn't charging. And this could mean a few things, such as: contaminated, defective, or the wrong battery make/type. Or it could be as simple as charging terminals needing to be cleaned.

Suggested Troubleshooting:
-Make sure you're using a Wagner 18-volt (18v) battery
-Use rubbing alcohol on a cotton swab to clean the battery and charger terminals. Allow it to fully dry, then try it on the charger again
-Insert and remove the battery a few times, if the charging light blinks green then it's charging
-If cleaning it doesn't work, then please contact our U.S. based product support team for help: wagnerspraytech.com/support