Controller displays LOBT or LOW BAT and generator will not crank or cranks slowly.

Safety first: Turn the controller to OFF. Wear eye protection when working around batteries.

• Inspect battery: Check the Briggs & Stratton-recommended starting battery for cracked case, bulging, or corrosion. Clean terminals with a baking soda solution and a wire brush.
• Check cable connections: Ensure battery terminals and ground connections at the frame and starter solenoid are tight.
• Measure battery voltage: With a multimeter, measure at the battery posts. Below ~12.4 V (for a 12 V system) indicates low charge. Charge the battery fully with an external charger and retest.
• Verify charger operation: With utility power present, measure voltage at the battery. It should be slightly above nominal (e.g., 13.2–13.6 V). If not, inspect the Briggs & Stratton battery charger module and its AC supply fuse/breaker. Replace the charger if it does not output proper voltage.
• Clear the code: After restoring proper battery voltage, cycle the controller to OFF then AUTO and perform a test start.