Tecmate TM500 - TecMate Charger Optimate DC To DC 12V Battery Charger

Features: Charge and maintain your battery without AC power. Powered from a DC source or another 12 V battery to remotely save, recharge and maintain stored vehicles 12 V battery. Great option for emergency vehicle-to-vehicle and off-grid charging. Built-in protection prevents deep discharge of the source battery. IP54 weatherproof, rated for use down to -40° C / -40° F.