Duralite Receiver 4400mAh 2S2P 7.4V Lithium-Manganese Redundant Battery Pack with built-in Balancing Safety Circuitry and (2) Leads with Universal Connector. Features: - Stay Balance circuit built into pack - Non flammable if punctured or overcharged - Longer life cycles than Li-poly - High charge rates up to 10C - 20/40C Cont/Max Discharge More Information (links): * Instruction Manual

Specifications:
Dimensions: 5 3/4" x 1 7/8" x 7/8" (145mm x 50mm x 20mm)
Weight: 10.25 oz. (290g)
Voltage/Capacity: 7.4V/4400mAh
Configuration: 2 cells in Series, 2 cells in Parallel

Always use with Voltage Regulator!!!!
Charge only with Li-Polymer Charger!!!!