This is the Astro Flight Lithium Battery Charger/Discharger. FEATURES: Charges 1-9 cell (4.2V-37.2V) Lithium Polymer battery packs Cell sizes can range from 140mAh to 8000mAh Charge current adjustable from 50mA for small packs to 8A for large packs Foolproof charging and discharging is insured with the use of an 8-bit microprocessor Six messages display during charging sequence including: Amount of charge current flowing into pack Number of cells charger "thinks" the battery contains Charging mode Voltage of battery being charged Duration of charge in hours, minutes, and seconds Number of milliamp-hours of charge put into battery pack 90 day limited warranty INCLUDES: One Astro Flight Lithium Battery Charger/Discharger with 4ft (122cm) 13 gauge input cord with alligator clips, 16 gauge output cord with Zero Loss Connector #526 pre-installed, and instruction manual REQUIRES: 12V DC regulated power supply, or the Hobbico Power Supply (HCAP0250). If using the Hobbico version remove plastic knobs from jacks or attach Banana Plugs to charger lead wires 12V automobile battery may also be used, see COMMENTS SPECS: Cell Type: Lithium Polymer Number of Cells: 1-9 Charge Rate: 50mA - 8A Charge Time Cut-Off: 1 hour Discharge Rate: 1.25A Discharge Cut-Off: 3V per cell Current Display: 50mA - 8A Voltage Display: 0V - 40V Charge Time Display: hours, minutes and seconds Milliamp Hour Display: 0 - 9.999 milliamp hours Supply Voltage: 12 - 15V Supply Current: 0.1 - 12A Length: 6-3/4" (171mm) Width: 5" (127mm) Height: 2-5/8" (67mm) COMMENTS: IMPORTANT! Never use an automobile battery charger as a power source. It could damage your charger.