Common Sense RC (4 Pack) Lectron Pro 3.7V 250mAh 30C Lipo Battery for Syma S107 & S107G Helicopters Lectron Pro batteries feature a high-end performance and reliability at an affordable price! Battery Voltage: 3.7V | Capacity: 250mAh | Maximum Continuous Discharge Rate: 30C (7.5 Amps) | Maximum Charge Rate: 2C (0.5 Amps) Battery Dimensions: 25mm x 20mm x 6mm / 0.98in x 0.79in x 0.24in | Weight: 7g Works great with Syma S107, Syma S107G helicopters (Always check the voltage, dimensions, and battery connector to ensure this battery will be a good fit for your vehicle/application) We're confident in quality of our batteries! All Lectron Pro batteries are covered by a 1 Year Warranty against any manufacturing defects and U.S. based support in case you run into any issues!