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FDK (formerly Sanyo) AA 2500 TX pack made to fit Hitec's new Aurora 9 and the Airtronics SD-10G. Excellent way to go when replacing a weak factory pack. 7.2 volts and 6 cells just more capacity. Comes without plug, choose below or reuse your old plug.
Break in (first forming charge) on 50mAh factory wall charger 700mAh-19.6 hours, 1100-30.8 hours,1650-46.2 hours, 2500-70 hours. For 70mAh wall charger deduct 28% of time, for 100mAh wall charger deduct 50% of time. Forming charge (initial charge) on peak detection chargers is not recommended and voids warranty. Individual Cell Internal Impedance 25.0mΩ
 "FDK/SANYO 2500mAh AA NiMH 7.2V 6-Cell 3x2 TX Pack")