... lamp, etc;7) Perfect protection functions: low voltage protection, high voltage protection,high temperature protection, short circuit protection, overload protection, ... discharge protectionBattery undervoltage protection21.6V/43.2V(Equipped with lead-acid battery, gel battery)shut off ... undervoltage recover protection24.4V/48.8V(Equipped with lead-acid battery, gel battery)Restore powerBattery ...