Universal 4 Battery USB Smart Charger, for 3.7V 18650 Lithium Batteries

NOTE: This charger comes in bulk packaging, without the retail box. If the power is turned on correctly and the battery is inserted correctly, the indicator light will turn off to show that charging is in progress. If the battery is inserted incorrectly, the indicator light will turn on. When the red light goes off, it means the battery is fully charged. Please remove the battery. Automatic recognition. Ensure the battery is inserted correctly for normal charging. When the battery is correctly inserted, the circuit will be disconnected, preventing current flow. For safety, always insert the battery in the correct orientation. Important notes: Use an adapter that complies with charging safety standards. Do not use with alkaline batteries. Avoid using with alkaline batteries. Compatible with charging battery types: 10440, 14500, 18650 . This charger is designed for indoor use within the temperature range of -10 to 40 degrees Celsius. Not recommended for children under 6 years old. Children under 12 should use it under adult supervision.