You can use the mobile phone Android charging cable to connect the 5V 500MA or 5V 1000MA charger to charge generally 6-8 hours, it is best not to exceed 10-12 hours because there is no charging indicator and I do not know when the battery is fully charged, so it is recommended to open the battery compartment and take out the 18650 battery. Go and buy a single\/multi-unit 18650 dedicated charging dock for charging