HuntHawk 4Pcs 3.7v 500mAh 25C Li-po Battery + 1 to 4 Multihead Balance Charging Cable + USB Cable for Mini Genius RC Quadcopter Spare Parts 1.Batteries Dimensions: (1.77 x 0.79 x 0.28)" / 42mm x 20mm x 7mm (L x W x H) 2.Charger Dimensions:(1.57 x 1.38 x 0.51)" / 43mm x 35mm x 13mm (L x W x H) 3.Voltage input: DC 5V, Voltage output: 4.2V  5%, Current output: 350mAh~410 mAh 4,This 4 in 1 battery charger allows you to charge 4 batteries at one time,Effectively reduce charging time,Always keep the spare batteries ready so as to extend your playing time. 5,every battery could use about 6-8 minutes.