Tube Integrated Battery

https://www.worldpowerbattery.com/products/tube-integrated-battery/

A tube integrated battery is a type of rechargeable battery that is seamlessly integrated into the frame tube of an electric bike. This innovative design eliminates the need for a bulky external battery pack, resulting in a sleek and streamlined appearance. Tube integrated batteries are often made with lithium-ion technology, offering high energy density and longer lifespan. These batteries can be easily removed for charging and provide the necessary power to the electric motor, enabling efficient and eco-friendly transportation. They are a popular choice among electric bike enthusiasts looking for a clean and minimalist look.