This is the HydriMax NiMH 9.6V 2000mAh Square Transmitter Battery with Universal Connector. FEATURES: Designed for use in transmitters that use an 8 cell square transmitter battery AA size cells with clear shrink wrap and universal connector INCLUDES: HydriMax NiMH 9.6V 2000mAh Square Transmitter Battery with Universal Connector REQUIRES: Battery charger such as; Any of the DuraTrax Onyx series Hobbico Quick Field Charger MkII, HCAP0290 DuraTrax Ice, DTXP4170 Hobbico AccuCycle, AccuCycle Elite, HCAP0280 Great Planes ElectriFly Triton Jr., GPMM3152 SPECS: Length: 3.9" (100mm) Width: 1.1" (28mm) Height: 1.1" (28mm) Cell Size: AA Capacity: 2000mAh Charge Rate: 100-250mA for 16-20 Hours Discharge Rate: Should not exceed 750mA Trickle Charge: 25-50mA Weight: 8.46oz (240g) COMMENTS: Do not charge with a standard NiCd fast charger. The fast charger"s cut-off will not work properly and batteries will overheat. Fast charge ONLY with chargers specifically designed for NiMH packs. jxs 12/07/10 ir/jxs