Powa Beam USB-C Rechargeable Lithium 18650 Protected 3.7v 3400mAh battery. Most commonly used in high powered torches, headlamps, RC toys, vapes etc. 

Features:

• 18650 Size
• 3400mAh capacity (also available in 2600mAh)
• 3.7V
• Charge either via standard USB-C into battery or in a lithium charging dock
• Built-in advanced protection board, prevents overcharge, over-discharge and over-current discharging
• Cable not included