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Microcomputer IC controls charging process: CC/CV/Trickle charging, to make sure the battery is full charged and won t be over charged; each slot controls independently; Mixed charging mode. LCD instantly shows the charging process, battery voltage, battery type and present charging capacity. Applicable batteries Compatibility: various kinds of cylindrical chargeable batteries (Diameter: below 26mm, height: 34-70mm) Charge 3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4 and 1.2V Ni-MH/Ni-CD batteries Adopt Negative voltage control technology to improve charge efficiency Protect opposite connection and short circuit. (LCD shows "null".) Activate automatically for Li-ion batteries with protection board, which are instantaneous short circuit. For the batteries voltage below 0.5V cannot be activated, LCD shows "null". Stainless steel rail is more durable and smooth. Worldwide voltage, suitable for the whole world. USB 5V Output Mode (used as Portable Charger for mobile or pad etc.)