The Nitecore V2 can charge 2 batteries at the same time with 3A fast charging in per slot. The Nitecore V2 automatically detects the battery power status and selects the appropriate charging mode. The charging current can also be set manually by users. With this type of current, charging takes less time than ever before. Constructed from fire resistant PC materials, the V2 adopts PID (Proportion Integration Differentiation) System to control the charging temperature and makes the battery safe.