External laptop battery is a product manufactured by our company is used up 3 Hr to 8 Hr and fits for kinds of computers. The feature as following: 1. More longer stand-by time: Lg, Panasonic cell and 60-138watt-hrs capacity can provide the computer 3hr to 8hr using time. 2. Capacity led Indicator: There are 4 leds that means battery capacity 100%-75%-50%-25% except charging led. 3. 16V/19V Voltage choose: Multvoltage choose meet most computer need of voltage and current. (voltage range 16v to 20v, max output current 4. 5A) 4. Mult-connector Output: Suited eight kinds connectors, make the battery easily link to most computer. Specification: *Battery Chemistry: Li-Ion *Capacity: 60-138watt-hrs *Input: (adapter Output): DC16. 8v/1. 5A *Output: 16v and 20v DC switch able *Charging time: 4hrs *physical Dimensions(mm): 155*105*29 *Accessories: One host pack, one output line, eight connectors, one AC Adapter for charging, one user manal