Feature: 1. Plane and Boat: This 4000mAh lipo battery is designed for RC plane, car, boat and other modified projects. 2. Long Lasting: This 7.4V 4000mAh RC lipo battery provides lasting working time, bring you longer entertainment time. 3. High Conversion: This RC boat lipo battery features stable performance and accurate design that can realize maximum energy conversion, providing high discharge performance and high power conversion rate. 4. XT30 Female Plug: This RC airplane lipo battery adopts XT30 female plug, it can be used as a backup battery or replacement battery to increase the service time of the remote control car. 5. Safe Material: This RC 8C battery is made of safe and durable materials, environmental protection, high performance is ensured, stable in structure. Specification: Item Type: RC 4000mAh Lipo Battery Material: Li Polymer Battery Voltage: 7.4V Battery Capacity: 4000mAh Discharge Rate: 8C Plug Type: XT30 Plug (Female) Product Color: Gray Product Size: Approx. 8.2 x 3.7 x 2cm / 3.2 x 1.5 x 0.8in (Excluding Connecting Wire) ( Manual Measurement, Slight Error May Exist ) Application: RC Aircraft, Car and Boat Batteries. Package List: 1 x RC 4000mAh Lipo Battery Note: 1. Please Allow 1 to 3mm Error Due to Manual Measurement. Thanks for Your Understanding.2. Monitors Are Not Calibrated Same, Item Color Displayed in Photos May Be Showing Slightly Different from the Real Object. Please Take the Real One As Standard.3. Do Not Use Any Device Other Than the Lithium Battery Charging System Specially Made for Lithium Batteries to Charge.4. Never Leave the Battery Unattended While Charging.5. Do Not Charge the Battery at a Current Lower Than 3 Amps or Higher Than 7 Amps.6. Do Not Connect the Positive and Negative Electrodes Together.7. Do Not Alter, Puncture, or Remove the Battery from the Case in Any Way.8. Do Not Use the Battery Less Than 6 Volts. Once the Vehicle Starts to Run Low, Please Stop the Vehicle Immediately and Take out the Battery.9. Do Not Discharge the Battery After Use.10. Do Not Store Batteries in the Vehicle.11. Always Store the Battery Charged at 50 to 100 Percents in a Safe Environment and Disconnect.12. Do Not Short Circuit the Lithium Battery.