This is the ProTek R/C High Capacity 1S Transmitter Battery with 5500mAh of capacity, for use with the Sanwa M17 Surface Transmitter. This light weight Li-Poly transmitter battery will help to dramatically extend the run time that your transmitter can offer, which is great for long days at the field!
Chemistry: Lithium Polymer
Charge Rate: 1C
Dimension (LxWxH): 79×46.5x12mm