The Xtreme Charge 5-stage Maintenance Battery Charger works with any 12-volt lead-acid battery including flooded, fill and charge, gel, AGM, and all maintenance-free varieties. Whether your battery is new or old, the patented Pulse Technology in our chargers minimizes the size of lead sulfate crystals to ensure that it keeps as much charge as possible. It doesn't matter if you're using traditional or high-performance batteries the proprietary charging algorithm will find the proper charge for maximum power. Just plug the charger into any 110-220 ac power source, turn it on and it will recharge the battery quickly and safely. It is fuse-protected, spark-proof, and UL Certified for both indoor and outdoor use, making the X2 Xtreme charger the ultimate 12-volt battery charging system!