Battery Spot Welder, Seesii 6 Gear Adjustable Portable Spot Welder, 5000mA-h Mini Spot Welding Equipment with 5m Sheets and 4X4 Holders for 0.1/0.15mm Nickel Strip Welding and Making DIY Battery Packs

I have saved numerous cordless tools by rebuilding the batteries with this spot welder. It is good for lightweight conducting strips, but probably not enough power for heavier conductors. Nonetheless, I still love the ease and convenience of this spot welder.

It’s suitable for building battery packs. I practiced with varying power levels on dummy batteries first. and found power 6 with medium pressure the best. Built a 7S pack 18650 that works great.The manual is bad. It mostly references other models that have a full display. It took me a little time to fiddle with the controls to understand how the 8 power levels are indicated with only 4 LED segments. Nevertheless I give it 5 stars because it works well and the price was right..

But the drawback are the short attachments, other than that it works

Excellent welder until you don't use it for a few months. Batteries died and would not re-charge. Not even a year old. Lasted 6 months.Edited: The seller made right by sending me a new unit WITHOUT contacting them first. They did it as EXCELLENT customer service. I was also told to make sure battery is charged EVERY 2-3 months. GOOD ADVICE to know if you purchase this unit.

Out of the box, unusable. The ends of the leads are supposed to be slotted so they compress when plugged in. One of mine was not and it was too large to plug in. I had to sand it until it would go in, but then due to its taper, it wasn't tight so I had to shim it with a sliver of the included nickel strip.As for performance, passable but not great. Anyone who has disassembled a battery pack knows that the factory spot welds are hard to get apart. Even at its highest setting, these are still pretty easy to pop apart. The 4 packs that I rebuilt are working fine, but only time will tell how they hold up to prolonged heat and vibration.

I'm no expert with a spot welder. I bought this to repair the battery pack for my backpack sprayer. I was hoping to repair the battery pack at a cost that was less than purchasing a new one. The initial cost is probably close to a new battery pack price, but any future repairs, of the 20 something packs, will be much less expensive. It worked for me.

This is a great little welder for 18650-21700 packs. For the cost the performance is amazing.....the only "trouble" I has was that the tubes that screw to the cables and hold the tips get hot after a few dozen welds. However that's probably a good thing as it forces you to stop and take a break which is probably a good idea as I am sure the capacitors and other internals also see some heat passing this much current.One thing that would be nice and I plan to install on mine is some tip sleeves so that only the very end of the tip is uninsulated. Several times while welding I accidently allowed the tips to touch which causes a huge discharge of current that I am sure the caps do not like....although the welder seems fine despite my clubsy ass doing it twice LOLs

To be honest, all of my soldering experience has been with a very simple hand-held soldering iron. So I was interested in the temperature control on this one. It turns out, at least in my use soldering some light gauge DC wiring together using the roll of pre-fluxed solder included, that you need to turn the temp almost all the way up. Perhaps there are other uses for the lower temperature settings, but they are not useful for me. At least so far. With the power at around 80%, I was getting good joins. There is no indication, other than the position of the potentiometer knob, what power level you are set at. There is, however, a power light in the handle of the iron itself, which other than feel is the only way to tell the unit is on.But as a whole, I like the station concept, with the holder for the hot iron, and the brass material for cleaning the tip, and the variety of tips included. It's very handy, especially for larger or longer soldering projects.However, you're not getting something for nothing here. The build quality is a bit lightweight. For instance, when you turn the potentiometer, the PC board inside moves a little, which causes the power lead to the soldering iron to wiggle, since it's on the same circuit board as the pot. This is not unexpected at this price point, but it hints at the truth about this unit: it's not high end in any way. It's a cheap soldering station at a fair price.I recommend this for people who dabble or need to solder things every now and then. It does the job, and it's more convenient than a soldering iron by itself with no station/holder. But if you are a hardcore hobbyist or use your tools to support yourself, then I believe you'd be better served by moving up the food chain a bit, as this is definitely an amateur tool.