PANASONIC EY9L51B32 18V 42AH LIION BATTERY For Panasonics highest performance pa new level of battery capacity has been introduced with pa range of pfeatures ensuring Panasonic battery packs are tough & longlasting The new Stype battery pack 144V & 18V with 42 Ah allows maximum endurance per charge Individual monitoring of battery cell voltage Each 36V segment is monitored by a psensor to ensure optimal discharge control preventing both overcharging & overdischarging of the battery Battery Overheat Protection Sensor OPS A temperature sensor cuts off power to the motor before the battery temperature rises to a harmful level adn flashes a warning lamp on the tool&39s control panel to notify the user