The Efest Slim K2 battery charger is an excellent, space saving and cost efficient universal battery charger. It’s perfect for travel and home alike. It has a micro USB slot which allows you to use it to charge other electric devices, such as phones, flashlights, e-cigs, etc...

NEW i2 Intellicharger: an upgraded edition of the i2, with enhanced compatibility, efficiency and intelligence.   - 100% charging acceleration - Active current distribution technology - Expanded compatibility to support 3.7V and 4.35V batteries - IMR battery restoration - Automatic current selection based on battery capacity - Automatic detection of non-rechargeable lithium batteries

NEW i4 Intellicharger: Revolutionary Design overhaul 5 new features A universal automatic smart-charger that works with most rechargeable batteries including IMR/Li-ion, Ni-MH, and Ni-Cd batteries.   - 100% charging acceleration - Active current distribution technology - Expanded compatibility to support 3.7V and 4...

This charger is capable of charging 8 cells at 0.5A, 4 cells at 1A, 2 cells at 2A and 1 cell at 3A. Compatible with the new 20700 & 21700 formats (see below for more compatible formats)...