Fluke etherscope external battery charger. Battery: lithium ion 7.2V DC (nominal), 4.2Ah, removable /rechargeable . Battery life is 4 hour typical, 10 hour in standby mode. External AC adapter/battery charger having AC input: 90 to 264 VAC, 48 to 62 Hz, 1.5-ampere. DC output: 15 VDC, 1.2-ampere (isolated output). Auto charger 12-Volt "cigarette lighter" charger with 6-feet (1.8-meter) fully extended coiled cord and LED power indication.