Step 2Battery pack assembly.
Given the position of the original packs leads, I used the 3rd and 4th battery as the ends, soldering #4's Pos pole to #1's neg. 1 then goes to 2, which goes to 3, which goes to the other terminal. Unfortunately I thought to take pictures only after I had assembled the pack with some clear tape. Also try not to short the batteries, they're usually shipped charged.
By the way use electrical solder with no lead in it. Lead solder is bad for you, and obviously you need to not breathe the fumes even with the good stuff. Check out the various soldering tutorials if you're new to it. Have aloe vera on hand, because sooner or later you're gonna burn something. Or wear welding gloves.
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