This is the ecopower 5-cell nimh aa sbs-flat receiver battery with a receiver connector. This battery features 2000mah capacity is ideal for use as a rechargeable battery for your transmitter, as well as many other applications. The recommended charge rate for these batteries is 1c for the best battery life and run time. Specifications: chemistry: nimh voltage: 6. 0 nominal number of cells: 5 capacity: 2000mah weight: 136g dimensions: 53x72x15mm connector type: rx configuration: sbs-flat max charge rate: 1c (ecp-5010)