His home-made microwave-transformer welder is too bulky to carry, so he got the AWithZ portable welder to see how it does. Found a Dayi-style tool battery (2-98V 20000, 10 cells); Samsung 2800mAh cells, genuine imports, each with a stamp on the negative end; internal resistance, capacity and voltage were checked before and match, so straight in. No dedicated nickel strip, so use the 15-cell one and trim the excess. Hold the power button two seconds, manual mode, gear 98, one pulse; first time using it, unfamiliar; quite solid, can’t pull it off, fully meets the requirement; keep going, never expected something this small to be so effortless, nailed it; pretty solid; an earlier small handheld was a bit lacking on this strip, never expected this one to handle it completely; supposedly max current 1200A, whether it’s really that high doesn’t matter, if it welds well that’s OK. Try the other mode (rapid-fire): two pulses, OK; gear set to 95 to try; it’s back in manual now, auto mode isn’t to his taste, sometimes it fires before he’s finished positioning; though auto mode has an adjustable wait time; still prefers manual; two pulses like this is better; turn the gear down a bit. Done, checked for misses; assemble: tape along both sides on top, BMS on and welded, finished; try it (angle grinder). The welder again: compact and easy to carry, didn’t expect much, just wanted portability, but the results are good, welds ordinary cells, definitely not large prismatic cells; the pen plug comes out and fits tight, gold-plated; the foot switch plugs in here, not normally used, just the button on the handle; charging cable, Type-C port; pins are replaceable, pull them out with pliers; nice design. Comments (23): how to set the two modes → by nickel-strip thickness, no blackening and it sticks is fine, 0.15 nickel-plated set mid-range; too pricey (1) → make one from a microwave transformer, works just as well but took two days; brand-name gear looks classy and welds well, AWithZ knows how to make a product (1); 98 is too high / will blow through; why is so much of the negative-end wrap missing; can it weld Jiashikai; can batteries be shipped yet.