Features: the new upgrade 18650 li-ion battery, high quality, long service life and eco-friendly. High capacity battery, rechargeable design for long term use. Low discharge rate, no memory effect. Built-in short-circuit and overcurrent protection. Suitable for most electronic products, such as torch, flashlight, power bank, toys, etc. Specifications: model: 18650 battery standard capacity: 3800mah rated voltage: 3.7v charging voltage: 4.2v ±0.05v charging current: 1a discharge current: 5200ma discharge voltage: 2.75v charging time: 5-8 hours working temperature: 0°C~50°C (charging) / -20°C~+62°C (discharge) dimension: approx. 68 x 18mm / 2.68" x 0.71"