This is the Gens Ace G-Tech 2S 4000mAh 60C 7.4V Round Shoulder Lipo Battery - Deans Gens Ace G-Tech Smart Battery Gens Ace batteries have been proven within the Radio Control community to deliver reliable and consistent performance for all modelers alike. All Gens Ace batteries offer superior cell matching at the factory, and are extremely consistent in selecting matched cells after each and every batch produced. Additionally, low internal resistance (IR), offers modelers stable voltage output through the whole duration of the battery. Smart G-Tech Technology Features: - Automatic identification and recording of all battery parameters - Adjusting charging parameters to improve safety - Balance plug with built-in chip and exclusive patented design technology - Protects and extend the battery life Specifications: - Nominal Voltage: 7.4V (2S) - Capacity: 4000mAh - Maximum Charge Rate: 4C (16A) - Discharge Rate: - Continuous: 60C - Peak: 90C - Cell Configuration: 2S1P - Watt Hours: 29.6Wh - ROAR Approved: No - Connector: - Battery: Deans - Balance: G-Tech Smart Connector - Dimensions (LxWxH): 5.43x1.89x0.87in (138x48x22mm) - Weight: 8.47oz (240g)