universal 18650 battery charger smart usb chargering for rechargeable lithium batteries charger li-ion 18650 26650 14500 17670 intelligent i

intelligent ic control, built-in reference voltage to ensure full battery charge,while ensuring safe use. automatically recognize the battery polarity, and it can be charged both positive and negative to ensure safe use. short-circuit protection function, short-circuit ic automatically cuts off the output, ensuring safe use. stable voltage output when no-load, the voltage is more accurate and stable, accurate charging and protecting the battery, ensuring safe use. when there is no battery in the charger, it lights up green, when it is loaded, the red light flashes, and it lights up green when it is full to ensure that the battery is fully charged.syi