The Hotronic S4+ Replacement Battery is a great option if you have lost or burned out an existing Hotronic Battery System. The S4+ has a longer lasting, stronger battery that can provide up to 21 hours of heat on the lowest setting (outside temperature depending). This battery pack is fully compatible with previous S4 model heating elements. New, Longer Lasting Battery, Compatible with S4 and S4+ Heating Systems, Model Year: 2022, Product ID: 607658, Model Number: 01-0100-1143, GTIN: 9120070765591