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📢WHY CHOOSE US?Best Design and Quality!You can charge 1 to 4 battery one time!Fit for for solar panel,Great for out door!Fit for different type battery!HOW TO USE:1.Buttons : While electricity is connected, 1) press the button to change the battery type,it will start to charge 5 seconds after setting the battery type (3.2V or 3.85V),1.2V Ni-MH and 3.7V li-ion can be detected automatically,so it need set for only 3.2V and 3.8V batteries; 2) change the charging current amount 2 current (500mA/1000mA) at any time during charging by long press the button.2.LED: While connect it to 5V input, all LED light up immediately, 1) If no battery is put in, 500mAh LED keeps on and others will go out 2) When battery is detected in, 4 LED lights on AND 3.7V LED keep flicker to indicate to set the battery type,if no operation,it begin to charge 5 seconds later automatically under detection,four LED lights will display the charging status.3) Tap the button can show the battery type for 5 seconds. 4) No electricity is connected, insert a battery can quick shows the remaining battery volume. 3.USB output indicator: When USB discharging port detected,indicator of battery volume will light up for 10 seconds and go out, press button to light up again. Features: Compatible Battery: C Battery,SC Battery,Ni-MH Ni-Cd 1.2V Battery,Li-Fe 3.2V,Li-ion 3.7V,Li-ion 3.85V,26650,22650,26500,18650,18490,17670,17500,17355,16340,14500,10440,etc 5V USB adapter (adaptor current 2A) is recommended. Input : Micro USB DC 5V/2A. Output: 1.42V 4.2V±0.05V 3.65±0.05V 4.35±0.05V. Current: 1000mA 500mAConstant voltage, cut-off current: less than 100mAh. Package include:1x battery charger1x USB cable1x User guide book.