OptiMate 2 DUO BRONZE series: 5-step 12V / 12.8V 2A sealed battery maintainer.. The powerful ‘no brainer’ battery maintainer for the hi-technology battery in any of your vehicles. Guarantees healthy lithium or lead-acid batteries!. Ideal for 12V lead-acid & 12.8V / 13.2V lithium LFP (LiFePO4) batteries.. Delivers 2 Amps charge current recommended for maintenance of larger batteries.. Charges and delivers long term maintenance. Connect to the battery and OptiMate 2 DUO does the rest, no supervision required!. DUO: Adapts automatically to Pb or LFP battery.. Safe to leave connected. Full electronic protection.. 24/7 Maintains battery at full charge and good health.. Low Volt Start of 4V.. Warns when battery damage is detected.. Green Technology: Energy saving technology, Stand-by power less than 0.5W and Efficient 24-7 battery maintenance.. IP54: Weatherproof. Rated for use down to -40°C / -40°F..