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unixaa Universal Portable Lithium-ion 4.2V Single Slot Battery Charger with LED Indicator. This li-ion 500mAh Battery is very convenient to install in your project where 3.7 Volt with high capacity is needed. The standard 18650 500 mAh 3.7V rechargeable li-ion Cell is a source of power for various portable devices including flashlights The charger automatically detects when your batteries are fully charged and stops the charging process to prevent overcharging, ensuring the safety of your batteries and avoiding potential damage. Wide use: Suitable for home, office, travel and other places, this charging equipment is a good supply for charging the batteries, and it is suitable for 220-240V input voltage only. A battery charger, recharger, or simply charger, is a device that stores energy in a battery by running an electric current through it. The charging protocol (how much voltage or current for how long, and what to do when charging is complete) depends on the size and type of the battery being charged.