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Oh snap. I just assumed the fuse wire would be too thin to spot weld. There ya go!

The two main methods I see of making battery packs are (1) soldering to a copper bus bar, or (2) spot welding nickel strips. What I like about option (1) is that it's easy to add fuses for each individual battery, but there's the danger of heating up the battery while soldering. Now, I know that...