2S800JST: 7.4 volt 800mAh LiPO 25C battery for R/E electric. Comes with red JST connector & Balance Charge connector. Dimensions: 2 7/8" x 1" x 1/2". Weighs 1.7oz (49gms). Ideal for R/C electric flying models. Re-charges with smart LiPO chargers such as YT-0006S, UP100AC, B3AC, Cool Charger, etc.