He even printed a small magnetic flashlight to reuse the light from the inverter which uses an 18650 cell that can be charged from the big battery in a charger built into the exterior of the pack.

"Learn the entire process of creating a powerful DIY super capacitor spot welder for 18650 batteries. The guide covers ...

Learn how to create a power bank using a plastic bottle, recycled materials, and an old 18650 electric bike battery pack. This innovative idea combines creativity with sustainability, turning everyday ...

[Make It Extreme] is working on a battery pack for an e-bike that has some interesting design features. The guts of the pack are pretty much what you’d expect – recovered 18650 lithium-ion cells.