PT5 is ahead of the competition. Combine that with casters and handles for easy installation, a full display, and complete battery-to-battery and battery-to-inverter communication, and you have one of the best batteries on the market. For those living in colder climates, we have you covered. The PT5 features a built-in heating system that automatically maximizes performance in cold weather and allows for charging at any temperature. The battery cells are also rated for -30°C discharge with no heating. Includes a built in 50W battery heater for winter operation. Stud Size 3/8″.