Joules chargers are named after the English physicist James Prescott Joules, who found the relationship between the flow of current through a resistance and the heat dissipated, now called Joule's Law.

Imitation is the sincerest form of flattery, so it is said, and Joules chargers were designed after the most trusted name in the charger business - Soneil. Joules chargers, like Soneil chargers, are three stage chargers, and complement our line of Soneil chargers by filling the gaps between their models. We have so much confidence in them we offer the same one year warranty on Joules chargers as we offer on Soneil chargers.