Me
#AWithZ Share your welding progress, a question or a finished build…
Public Post
Who to followRefresh
LV2
Maker Zhou Xiansen builds a night light from 18650s: first an intro to the AWithZ U3 handheld welder he received (power-bank sized, USB output, 80 gears, manual / auto), then manual-mode spot welds of nickel tabs onto the 18650, a copper-wire ring for the lamp frame, LED filament, potentiometer module and USB charging module — an immersive, no-narration build
A friend asked for a night light made from 18650s. First an intro to the AWithZ U3 handheld welder he recently received: very compact, about the size of a power bank, with a USB output that can charge a phone; the weld strength gear is set by material, and 80 gears cover every need; supports manual or auto spot welding — in manual mode a press of the pen button fires the weld, and the result is excellent (demoed by welding a nickel tab on a cell’s negative end). Then an immersive no-narration build: nickel tab leads spot-welded onto purple 18650 cells, copper wire wound into a ring as the lampshade frame, LED filament and posts soldered, potentiometer / charging module and USB socket, several 18650s spot-welded side by side as the lamp base; the finished piece is a retro filament-style table lamp. Comments ask what the lamp-tube part is called, which control module to use, where the battery connects (couldn’t tell), what about charging, how thick the copper is; some say “toy welder” or “third-hand welder?”; a suggestion that with a housing it could be sold.
Ep. 61 | Last time a friend asked for one made from 18650s — today we build it; the full build is in the video, please watch patientlyProjectsMaker Zhou
LV3
The pesticide sprayer’s battery was drained dead, so a 12V 3S3P Li-ion pack is built from 9 HIGHSTAR 18650 2500mAh cells (4.2V, internal resistance 15.7–16): AWithZ U3 (nameplate 4.2V/650A, 11000mAh, 80 gears, manual trigger, doubles as a power bank) — the nickel strip tears before the weld lets go; BMS soldered in order, 4.2/8.4/12.6V check out, leads soldered to the terminals, sealed with glue, the sprayer pumps water again
A friend brought over a faulty pesticide sprayer; a check showed the battery had been drained dead, so a new Li-ion pack is made. Parts: battery box, connecting nickel strip, BMS, 18650 cells — HIGHSTAR ISR18650-2500 cells, 2500mAh; measured 4.2V, internal resistance 15.7/16, consistency is decent. The welder is an AWithZ U3 (nameplate: spot-weld output voltage 4.2V MAX, output current 650A MAX, Type-C input 5V/2.1A, USB output 5V/2.4A, battery 11000mAh 3.7V 40.7Wh, manufacturer Shenzhen Juequi Technology), only palm-sized, 11000mAh battery, 2-inch HD screen, 80 adjustable gears, manual trigger button; not just a spot welder but also a power bank. Weld strength test: the nickel strip tore and the weld still didn’t let go. The pack is 12V, three in series, three in parallel; the BMS is soldered to the cells in order; 4.2V, 8.4V and 12.6V all check out, so the welds are fine; the pack’s positive and negative leads are soldered to the terminals on the housing; the housing is sealed with glue; fitted, switch on, water comes out — perfect repair. Comments: it’s a sprayer, not a spray (liked by the creator); a 3S2P with a BMS gave no output even after swapping several boards; 9 cells isn’t enough; swap the original lead-acid for Li-ion and one charge on the lead-acid charger and “uh-oh”.
How to build a 12V outdoor-power Li-ion pack from 18650 cellsProjectsLookAgain