Delivering power when you need it the Mighty Max ML1 3-12 12 Volt 1 3 AH uses a state of the art heavy-duty calcium-alloy grid that provides exceptional performance and service life in both float and cyclic applications The ML1 3-12 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