Battery Tab Spot Welder

BobW said:

Thanks.
With all of the rechargeable battery packs that I have, it should pay for itself quite quickly.

Click to expand...

BobW said:

I see that Amazon and other sellers now have some very inexpensive spot welders for battery tabs.

Kecheer DIY Spot Welder Pen, Integrated Type Spot Welding Pen Automatic Trigger Weld Machine Accessory for 18650 Battery : Amazon.ca: Tools & Home Improvement

Kecheer DIY Spot Welder Pen, Integrated Type Spot Welding Pen Automatic Trigger Weld Machine Accessory for 18650 Battery : Amazon.ca: Tools & Home Improvement

www.amazon.ca

I have been looking at this one, but I am a bit puzzled.

I simply want to do some occasional 18650 spot welding.

I notice the 2.1mm plug, so I assume I would plug that into a female balun and wire up to 12v 5amp power, however
I noticed a youtube vid where the bottom two lugs are connected to decent amperage cable and powered that way, I assume ignoring existing cable.

Would anyone know the best way to get this one working properly, as in, will it work straight off using cable in picture?.

I have tried unsuccessfully the following:
BIFRC Dh20 (cable got hot & mofset blew after 3 tries) I am stuck with it

I also tried a more expensive one:
https://www.amazon.co.uk/gp/product/B08HRQ3CW7/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
This one was very very weak at the highest level, (4) so was sent back.

I also tried a Green-Cap 2.7v 500f Super Capacitor (showed incorrect voltage straight away, charged to 2.6v showed at 2.0v on meter
Then when charged at 3.0v (to get to 2.6v) it showed at 2.5v, was very hot and had ballooned out at the bottom,
the way a bike battery does when regulator has failed. (thrown in the bin, glad it did not go bang)

I just need something to work for me so any thoughts would be greatly appreciated

Thanks

Click to expand...

Luddite said:

I have been looking at this one, but I am a bit puzzled.

I simply want to do some occasional 18650 spot welding.

I notice the 2.1mm plug, so I assume I would plug that into a female balun and wire up to 12v 5amp power, however
I noticed a youtube vid where the bottom two lugs are connected to decent amperage cable and powered that way, I assume ignoring existing cable.

Would anyone know the best way to get this one working properly, as in, will it work straight off using cable in picture?.

I have tried unsuccessfully the following:
BIFRC Dh20 (cable got hot & mofset blew after 3 tries) I am stuck with it

I also tried a more expensive one:
https://www.amazon.co.uk/gp/product/B08HRQ3CW7/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
This one was very very weak at the highest level, (4) so was sent back.

I also tried a Green-Cap 2.7v 500f Super Capacitor (showed incorrect voltage straight away, charged to 2.6v showed at 2.0v on meter
Then when charged at 3.0v (to get to 2.6v) it showed at 2.5v, was very hot and had ballooned out at the bottom,
the way a bike battery does when regulator has failed. (thrown in the bin, glad it did not go bang)

Click to expand...

BobW said:

I see that Amazon and other sellers now have some very inexpensive spot welders for battery tabs.

Click to expand...

Nigel Goodwin said:

They all look too underpowered to be of much use.

This is the one we have:

SUNKKO 737G Professional Quick 18650 Battery Spot Welder, Welding Machine and Soldering Station Portable Pulse Welding Machine with Pulse & Current Display Welder Kit : Amazon.co.uk: DIY & Tools

Free delivery and returns on all eligible orders. Shop SUNKKO 737G Professional Quick 18650 Battery Spot Welder, Welding Machine and Soldering Station Portable Pulse Welding Machine with Pulse & Current Display Welder Kit.

www.amazon.co.uk

Even with that it's best to stick to the thinnest metal strips in order to get a good weld - thicker ones don't work as well. We run it on the highest current setting, and on double pulses.

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