With their rugged construction and advanced AGM (Absorbed Glass Mat) design, Power-Tec batteries are guaranteed to provide superior power and maintenance-free use. These batteries are environmentally friendly, spill-proof, and engineered to withstand the damaging effects of shock and vibration. The highly porous microfiber separators trap electrolyte, improving service life and off-season storage. The ETX30LA - exclusive to this line - is designed for use in FOUR-Stroke engines, allowing for higher power. Made in U.S.A. 12 Volts.