This is the 2S 7.4V 250mAh LiPo Battery Pack for use with the Extra 300 EP 2.4GHz RTF (COXA6502). FEATURES: Pre-installed balance and red 2-pin connectors INCLUDES: One 2S 7.4V 250mAh LiPo Battery REQUIRES: Installation in the airplane 2S LiPo Charger, COXP5820 A/C Power Adapter, COXP5821 SPECS: Length: 38mm (1.5") Width: 21.5mm (.85") Height: 11mm (0.43") Weight: 15grams COMMENTS: Never charge in excess of 4.20V per cell. If the battery should become damaged, discard the battery. Do not attempt to use a damaged battery. Disconnect the battery from the charger and carefully move the battery to a fireproof location if the battery begins to swell or smoke! Never charge at currents greater than 1C. Always charge in a fireproof location. Never trickle charge. Never allow the battery temperature to exceed 150° F (65°C). Never disassemble or modify pack wiring in any way or puncture cells. Never discharge below 2.75V per cell. Do not place the battery on a flammable surface or near a combustible material while in use. jml 3.22.12 lmm 2.9.11