Firefly’s ‘workhorse daily grind’: hooked on the U3 Pro, takes a cleaver to it to unwind, then gets to real work — CNC-milled copper tabs, 3D-printed four-hole holder, laser engraving, a 2S2P flashlight pack (Wurkkos SP10 and other 8.4V lights), multimeter check after welding, green heat-shrink; comments: 1mm copper plate won’t take a weld, no BMS fitted (stock has none either, a generic board won’t fit a flashlight), ‘even 1.5 nickel-plated is a struggle, badly over-rated, just returned mine’ (creator: no sponsorship money exists)
Opens with ‘I’m hooked, taking my ex’s cleaver to unwind, weld weld weld’, then ‘real work comes first’. Process (no narration, watching the footage): CNC-mill small copper tabs (comment: 1mm copper plate is a bit thick and won’t take a weld, hence small tabs); 3D-print a four-hole cell holder; caliper measurement; laser engraving; four cells (14500/16340-class small cells) go into the holder, the U3 Pro spot-welds nickel strip into 2S2P; multimeter reads about 7V (2S); green heat-shrink seals it into a flashlight pack that goes into a Wurkkos SP10-class 8.4V light; ‘open for business +1’. 73 comments: how much sponsorship did you take, even 1.5 nickel-plated is a struggle, badly over-rated, just returned mine (no sponsorship money exists); not even a BMS? (no suitable board, the stock battery has no balance board either, a generic board won’t fit in a flashlight, a small board trips output protection the moment the light turns on); thought you’d weld the copper on directly (1mm copper plate is a bit thick, won’t take a weld); CNC and Fluke too, the weak student has the most tools; will careless welding hurt the discharge cap’s life (liked by the creator).
Ep. 31 | Very ‘open for business’, good morning, a workhorse’s daily grind, energy +1 — hand-building a 2S2P flashlight pack for the Wurkkos SP10 and other 8.4V flashlightsProjectsFirefly