Panasonic CGR18650 Lithium Ion Li-ion 3.7 Volt 1400 mAh Rechargeable Batteries 2pk 2 Panasonic CGR18650 3.7 Volt 1400 mAh Graphite Lithium Ion Li-ion Rechargeable batteries. (Pack is 7.4 volts@1400mah) -Lightweight about 45 grams per cell. -Very high power/weight ratio. -Panasonic specs show the 18650S series to be a minimum of 1300 mAh (may be as higher as these were specifically manufactured as an OEM (manufacturer`s) battery - not a low cost consumer product.) Ideal for battery pack builders.