This single slot portable battery charger can charge many types of Li-ion batteries, including 18650, 14500, and more. It features intelligent IC control, output short circuit, and anti-reverse protection. The charger has a small size and light weight, making it easy to carry in a bag or pocket. The LED light indicates charging status, turning red when charging and green when fully charged or empty. The charger is compatible with a variety of battery types and can be powered via USB.