7.4V Dual Cell 18650 Lithium Battery Case

Material: high quality plastic,  quality wire.
Dimensions: Length 76mm, width 42mm, height 19mm
Weight: 14 grams
Output voltage:
for 2pcs 18650: 3.7 * 2 = 7.4V
for 4pcs 16340: 3.7 * 4 = 14.8v - See more at: http://www.ewallpk.com/home/1278-plastic-18650-battery-case-environmental-protection-cover-shell-for-18650-16340-battery-74v-12v-.html#sthash.anrrMQaF.dpuf