This charger can only charge cylindrical lithium-ion batteries (3.7V, 3.8V), nickel-metal hydride/nickel-cadmium, and lithium iron phosphate batteries. Use 5V USB adapter to charge (adapter current recommended 2A) The charger may heat up during charging and discharging, be careful not to burn When you stop using it, please unplug the power supply and unplug the battery Can only be used indoors Colour: Black material: plastic Electrical technical parameters: Input power: Micro-USB DC 5V/2A Output voltage: 1.42V 4.2V +/- 0.05V 3.65 +/- 0.05V 4.35 +/- 0.05V Output current: 500mA/1000mA Constant voltage charging, cut-off current: less than 100m A External power supply standby current: less than 15.0m A USB output function: USB port output no-load voltage: 4.90-5.30V Output current: 1000 m A No-load current: less than 1m A When load 1000m A current, its port output voltage: 4.75-5.25V Stop output protection voltage: 3.0 +/- 0.1V Compatible batteries: Li-ion / IMR: 18650, 18490, 18350,