EverLast CTX4L-BS 12V AGM Battery (Fresh Pack, Maintenance-Free Battery with Acid 6-Pack Bottle -4 7/16 L X 2 3/4 W X 3 7/16 H) Why Buy an EverLast AGM Battery? Exceptional starting power, longer life, durability, spill proof, and holds a charge up to 3-times longer than a conventional battery! Power: the Advanced AGM technology combines high density plate paste Maintenance free: no worries about acid leaks or checking fluid levels ever again and designed for less frequent charging during off Season storage Fill and charge: exact fill volume acid bottle delivers the correct amount of electrolyte (acid) with no leftover disposal required Fill and charge: exact fill volume acid bottle delivers the correct amount of electrolyte (acid) with no leftover disposal required