Common Sense RC (2 Pack) Lectron Pro 3.7V 700mAh 30C Lipo Battery with Walkera Connector for Estes Proto-X FPV Quadcopter Lectron Pro batteries feature a high-end performance and reliability at an affordable price! Battery Voltage: 3.7V | Capacity: 700mAh | Maximum Continuous Discharge Rate: 30C (21 Amps) | Maximum Charge Rate: 2C (1.4 Amps) Battery Dimensions: 50mm x 30mm x 7mm / 2in x 1.2in x 0.3in | Weight: 20g Works great with Estes Proto-X FPV Quadcopter (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!