Features: Able to charge over twice as many types of batteries as its previous model; Automatic current selection chooses optimal current based on battery's capacity; Capable of setting the charging voltage of each bay individually; Active Current Distribution (ACD) technology ensures optimal dispersal of charging current amongst installed batteries; Automatically detects non-rechargeable batteries and notifies user; Overcharge protection automatically stops charging after 20 hours to prevent overheating; Reverse Polarity Protection prevents damage to both batteries and charger; Special charging setting specific for IMR batteries; Made from flame retardant and flame resistant materials; Compatible with: --Li-ion / IMR / LiFePO4: 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14350, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500,18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650 --Ni-MH / NiCd: AA, AAA, AAAA, C, D Dimensions: 140mm x 94.8mm x 37mm Bullet feature 1 (optional) : Major upgrade, now twice the charging speed of the original i4 charger, up to 1.5A. Also compatible with 1.2V, 3.7V, 4.2V, and 4.35V batteries Bullet feature 2 (optional) : Li-ion / IMR / LiFePO4: 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14350, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500,18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650; Ni-MH / NiCd: AA, AAA, AAAA, C, D Bullet feature 3 (optional) : New Active Current Distribution diverts power to the batteries that need it most, ensuring optimal quick charging Bullet feature 4 (optional) : The perfect charging solution for IMR batteries, with an optimized charging system just for IMR, and 0V depleted battery recovery Bullet feature 5 (optional) : Automatically stops charging when battery is complete, and intelligently ends charging after 20 hours to prevent overheating Search terms (optional) : INR Intelligent Intelli Version Upgrade Universal Rechargeable Dual two slot bay independent Vape Vaping 18650 protected Unprotected Fast Quick Vaporizer The 2014 version has been discontinued by the manufacturer, as seen here: http://charger.nitecore.com/product/intellicharger-i2 The new version can be found here: http://charger.nitecore.com/product/new-i2