Panasonic EY9L53B 18v 3.0Ah Lithium-Ion Battery The Panasonic 18V lithium-ion 3.0Ah battery pack is tough and long lasting. The advanced cobalt technology delivers greater output than other manganese lithium-ion batteries and is less prone to an increase in temperature, resulting in longer battery life. This pack is light weight, compact and easy to attach and detach from the tool body. FEATURES Ultra slim: the \'perfect size\' for working in confined spaces Excellent power-to-weight ratio: this Panasonic 18v 3.0Ah battery is powerful yet lightweight 250% longer lifetime than Panasonic\'s older Lithium-ion batteries No memory effect: this Panasonic 18v 3Ah battery can be charged at any time regardless of its current charge state Virtually no self-discharge for maximum runtime and a long lifetime Individual monitoring of battery cell voltage: each 3.6V segment is monitored by a sensor for optimum discharge control to prevent overcharging and overdischarge Overheat Protection Sensor (OPS): a temperature sensor cuts off power to the motor before the battery\'s temperature reaches a harmful level and alerts the user via a flashing light on the tool\'s control panel Heat Resistance Layer (HRL) technology: a special coating separates the battery cells and protects against overheating SPECIFICATION Voltage: 18V Amp Hours: 3.0Ah Type: li-ion Weight: 0.6kg