DataSafe NPX-35TFR - 12 Volt/35 Watts per Cell Sealed Lead Acid Battery with 0.250 Connector - Flame Retardant Case EnerSys DataSafe NPX valve regulated lead-acid batteries are designed for high rate discharge applications. These batteries are used primarily where high wattage is required for a short duration. 50% more wattage available and a 30% reduction in size over conventional batteries. Sealed AGM design for guaranteed leak proof operation in any position except inverted Complies with non-spillable battery regulation, per IATA special provision A67 and 49 CFR