This is the ecopower 4-cell nimh aa sbs-flat receiver battery with a receiver plug. 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: 4. 8 nominal number of cells: 4 capacity: 2000mah weight: 111g dimensions: 60. 4x52. 6x14. 9mm connector type: rx configuration: sbs-flat max charge rate: 1c (ecp-5007)