Features: ElevateS your battery compatibility with our 18650 to 20700/21700 Battery Adapter, accessory for electronic enthusiasts and gadget users. Crafted from ABS, this adapter seamlessly transforms your existing 18650 batteries to fit devices requiring 20700 or 21700 batteries, ensuring secure connection. This battery extenders is perfect for anyone expand the usability of their rechargeable batteries across various electronic devices. Whether in home or on the go, this battery adapter is essential tool for powering flashlights, portable fans, electronic toys, or any device that requires a 20700 or 21700 battery size. Simplified your power needs with this innovative battery converter; simple yet effective solution for maximizing the potential of your rechargeable battery collection without the need for multiple spares. Specifications: Component:ABS Color:Redness/Blue/Black Size:Approx.30x21.5mm/1.18x0.84inch Package Includes: 1Pc Battery Sleeve note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.