Batteries·Display messages
SUL on your charger? Decode the message.
What the message can mean, why the charger model matters, and why it is not an automatic verdict on the battery.
THE EQUIPMENT FIELD GUIDE
Batteries & charging
Charger messages and battery condition. Start with the question you have and check the details for your model.
02 GUIDES
Batteries·Explained
What “sulfated battery” actually means.
Understand the lead-acid chemistry, the limits of symptoms, and the difference between a condition and a recovery claim.