This is the SMC "C-MAX" 7.4V, 50C, 5400mAh Hard Case Li-Poly Battery with Deans Connector. SMC a is company started by a racer, for racers. The goal at SMC is to provide R/C enthusiasts with the best batteries on the market. Whether you are competing for a world championship or competing for bragging rights in your backyard, SMC has the batteries you need.