The Nitcore Intellicharger i2 is the upgraded edition of the i2 universal battery charger which features  automatic smart-charging and is compatible with almost all types of rechargeable batteries including 1.2V 3.7V 4.2V 4.35V batteries, the i2 provides efficiency and intelligence.

Included in this bundle is a pair of two 18650 batteries. It is an unprotected battery, with a nominal voltage of 3.6V and flat terminals.