Will I Damage my batteries if I leave it charging after it is fully charged?

Your Snow Joe charger and battery are equipped with overcharge protection, which means that once the battery reaches full charge it will stop charging despite being plugged into the charger.

Although your battery is safe from being overcharged, you should always disconnect the battery from the charger when fully charged as the charger will not automatically shut off until you disconnect it from your electric outlet. 

Please read the safety instructions inside your product manual for safe handling of batteries.