Generator cranks slowly or not at all, but no error code is displayed on the Ryobi controller.

Safety first: Turn the generator OFF and disable AUTO. Wear eye protection when working with batteries.

• Inspect terminals: Open the battery compartment and check for corrosion or loose clamps. Clean and tighten as needed.
• Measure voltage: Use a multimeter to check battery voltage. Below ~12.2 V indicates low charge. Charge the battery with an external charger until it reaches at least 12.6 V.
• Load test: If available, use a battery load tester to verify the battery can maintain voltage under load. Replace if it fails.
• Check charger output: With utility power present and the generator in standby, measure battery voltage after several hours. If it does not rise, the internal charger may be faulty and should be serviced.