The soldering iron hasn’t been lasting lately, so a new battery from 8 × 21700 — Lishen cells pulled from floor washers and the like, IR around 9–10. Using the AWithZ H2 handheld spot welder; the strip cut in advance wasn’t enough, so more is cut; no holder, because the waterproof box is a fixed size and with a holder a battery this big wouldn’t fit, so the cells are hot-glued instead. Welding done, pack voltage measures 14.43V; old battery removed; the new BMS hasn’t arrived so it isn’t fitted yet, just solder on the two + / − leads. Comments ask whether the IR meter is any good and for a store link, and why not use fibre tape for a sturdier build.