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unixaa Universal Portable Lithium-ion 4.2V 18650, 16340, 14500, 17670 Rechargeable Dual Slot Battery Charger with LED Indicator. 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.SPECIFICATION- Material: plastic.- Color: black. Power- supply: AC powered.- Input voltage: AC 220-240V.- Output voltage: DC 4.2V/500mA- Charging indicator: charging is red, charged is green.- Suitable battery: 10440, 14500, 16340, 16650, 18350, 18500, 18650, 26650.FEATURES1). Home Travel Wall AC Multifunctional Universal Battery Charger2). Automatically stops when charging is complete3). Red/Orange light when charging, full of turns green, auto stop charging4). Designed to charge your batteries quickly and safely5). Designed for single cell Lithium -ion batteries with a 4.2V output6). Fast and efficient charging performance