This is the Helios RC 2S 50C 2000mah LiPo Battery with Deans Connector. Featuring a higher 50C discharge rating this pack can handle brushed or brushless setups with ease. Built with high quality material Helios RC batteries are an excellent value and offer fantastic performance.
Battery pack performance typically improves after initial use. Helios recommends going through 5 charge/discharge cycles before the battery is considered "broken in".