Spot Welder 12V For 18650 Lithium Battery DIY Kits Adjustable Power Spot Welding Machine Digital PCB Nickel Sheet -- 12V 99 Gear DIY Spot Welder Kit Adjustable Power Digital with Pen Spot Welding ...
[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.