- Fenix 18650 rechargeable lithium-ion battery, designed for LED flashlights and high-drain electronic devices - 4000 mAh capacity provides longer runtime and energy efficiency - Advanced protection circuit prevents short circuits, overcharging, over-discharging, and overheating - Pressure relief ventilation system to prevent explosions and increase safety - Compatible with micro USB or USB-C charging (depending on model), making recharging easy anywhere - Guarantees up to 500 charge cycles with at least 75% of initial capacity - Voltage: 3.6 V, recommended charging current: 1 A, maximum: 2 A - Approximate weight: 50 g, standard dimensions: 69 mm length and 18.6 mm diameter - LED charge status indicator for added convenience - Eco-friendly and economical alternative to disposable batteries, helping reduce waste - Ideal for users seeking reliability, safety, and high performance in their electronic devices