Build a 21700 pack (≥4S) with any AWithZ spot welder and submit photos or video of the finished pack plus a recipe card. Judged on weld consistency, construction and safety (BMS, insulation). Prizes: 1st prize P60F ×1 · 2nd prize UF20B ×2 · 3rd prize welding-pin set ×10 Deadline: 2026-10-18 · 36 entries so far