Delivering power when you need it, the Mighty Max ML18-12GEL 12 Volt 18 AH (Maintenance Free) battery which features a built in volt meter and charge status indicator Requires no addition of water during the life of the battery. The Mighty Max ML18-12 GEL is a TRUE DEEP CYCLE battery that can be mounted in any position, requires no maintenance. When a Gel Cell battery is charged, no hazardous fumes escape the battery case, gases are processed within the battery itself. The ML18-12GEL is an Absorbent Glass Mat (AGM) technology with a valve regulated design, that can be used in enclosed and indoor environments without leaking or maintenance, providing a superior performance for thousands of models. Factory activated GEL battery. Maintenance free. No acid pack needed. Advanced design works right out of the box and requires no maintenance yet offers the option to prolong the standard life by adding extra electrolytes. Mighty Max GEL batteries are utilized in a wide variety of applications including; Consumer Electronics, Electric Vehicles, Engine Starters, Golf Carts, Hunting, Lawn and Garden Tools, Medical Mobility, Motorcycles, Power sports, Portable Tools, Solar, Toys and Hobby, Access Control Devices, Emergency Lighting, Security and more. Internal Thread Terminal, No wire harness or mounting accessories included. 4 Pack