Common Sense RC (4 Pack) Lectron Pro 3.7V 300mAh 35C Lipo Battery with MCPX Connector for Blade Nano QX 3D and mCP X + MCP/MCX Parallel Charging Board Lectron Pro batteries feature a high-end performance and reliability at an affordable price! Battery Voltage: 3.7V | Capacity: 300mAh | Maximum Continuous Discharge Rate: 35C (10 Amps) | Maximum Charge Rate: 2C (0.6 Amps) Battery Dimensions: 43mm x 17mm x 6mm / 1.69in x 0.67in x 0.24in | Weight: 8g Works great with Blade Nano QX 3D and mCP X (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!