Battery for Laptop-Portable Power Supply 1.capacity:400Wh 2.Output :5V/2A,11.1V/15A,19V/6A,16V/6A Backup battery-Portable Emergency ... Functions: 1.Used for 5V/19V/16Vdevices,2. High capacity, portable, backup,universal, external ,convenient to carry.3. Various circuit function ... low power alarm pattern:LED indication and buzzing Battery for Laptop-Portable Power Supply