2 Cell 7.4V Li-ion NCR 18650 3500mAh Battery w\/ XT30 Connector from Admiral - ADM6024-011
Assembled using high quality imported Taiwanese NCR 18650 cells, this Admiral Li-ion battery is intended as an upgrade battery for surface vehicles using 2s 7.4v voltage and an XT30 connector. Double the capacity of standard 18650 Li-ion cells, this pack's 3500mAh capacity significantly extends drive time and can sustain higher current draw conditions. 
Note: This battery pack is Li-ion (Lithium Ion) chemistry. It is not Li-Po (Lithium-Polymer) chemistry. Set your charger to charge 2s 7.4v with Li-ion chemistry.