Hand-building FPV drone packs, part 1! Not easy to make

Hand-building FPV drone packs, part 1 (materials): 21700 vs 18650, fish paper, a balance connector matched to the S count, power leads, copper and nickel strip, heat-shrink; tools are scissors, a soldering iron and the AWithZ UF20B (ready in 1 minute vs 20-plus for others, 10.5kW / 1750A, welds 0.4 nickel-plated steel strip, auto / manual, preheat 1–10ms, 1–2 pulses)

Bilingual Chinese / English captions. Followers want to DIY FPV drone packs with a good discharge rate and long flight time, so first the prep: the pack body is 21700 or 18650 — the former has a higher discharge rate and more capacity but is bigger, choose to suit; fish paper; balance leads (pick a balance connector for however many S you need); power leads; copper and nickel strip; heat-shrink tubing for the outer protection. Tools: scissors, a soldering iron, and most important the spot welder — this AWithZ compact spot welder UF20B, which reaches welding condition in about 1 minute, much faster than the 20-plus minutes of other welders on the market; high power, up to 10.5kW, up to 1750A output; officially rated to weld 0.4mm nickel-plated steel strip, easily enough for drone packs; the welding pen has two modes: auto (press and it fires) and manual (pen trigger); preheat time selectable 1–10ms, 1 or 2 pulses selectable; screen reads 29°C. Assembly next episode. Comments: ‘it’s your fault, I bought the same one’; 18650s blow up easily, pouch cells are safer (creator replied); can pouch cells be used (creator: yes); only use it a few times a year so bought a P60F; does the welder go bang.

Outcome

Steps4 steps · click a frame to jump

1. 
   1. Materials: 21700 / 18650 choice, fish paper, balance leads, power leads, nickel strip, heat-shrink

   21700 has a higher discharge rate and more capacity than 18650 but is bigger, choose to suit; fish paper; a balance connector for however many S you need; power leads; copper and nickel strip; heat-shrink tubing.

   00:01 – 00:27
2. 
   2. UF20B: ready in 1 minute, 10.5kW, 1750A, welds 0.4 nickel-plated steel strip

   Tools are scissors, a soldering iron and the spot welder; the AWithZ UF20B reaches welding condition in about 1 minute, faster than the 20-plus minutes of others; up to 10.5kW, 1750A; officially rated to weld 0.4mm nickel-plated steel strip; welding pen.

   00:27 – 00:54
3. 
   3. Auto / manual mode; preheat 1–10ms; 1–2 pulses

   Auto fires on contact, manual fires on the pen trigger; preheat selectable 1–10 milliseconds; one or two pulses selectable; screen reads T 29°C.

   00:54 – 01:14
4. 
   4. Assembly next episode

   Materials and tools covered; assembly is taught next episode.

   01:14 – 01:19

Bill of materials

Creator’s tips

• 21700 has a higher rate and capacity but is bigger — choose by what the drone needs 00:01
• Pick the balance connector by S count 00:14

Li-ion safety

• Comment: 18650s blow up easily, pouch polymer cells are safer (creator replied)

Quotes

Cost & time