SOLDERING 18650 BATTERY - SAFER & MORE CAREFUL 

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That is a cold solder joint. Can come apart when you don't want it to. You did some things right and some things wrong. Solder does not grab metal like a finish in woodworking, it wets to the metal. Sanding is good but use the fine sandpaper. The purpose is to remove the oxide layer that the solder will not wet too. Clean before and after sanding with acetone. On soldering, only use a soldering station that will keep a steady temperature, not a soldering iron that just is on and keeps heating. Put a good amount of liquid flux on the pad and wire you want to pre-tin. Use a big soldering tip that can dump a lot of heat fast. This will get the soldering done faster so less heat total. Apply more flux and solder. Use only enough solder to get a visible fillet. Too much and you can have a cold solder joint that will hold but is weak and will break. Any humps in the solder is a bad sign. To the never solderers, the above process will create a superior joint than spot welding and not dump too much heat. The electrical contact is an order of magnitude higher and the ability to use copper leads to lower resistance of the pack which is superior in high power applications.

Scratching the surface of the battery connector!! That trick made it work for me. Thank you!

That stuff is called tip reconditioner, it is used when the soldering iron tip becomes oxidized. This rarely happens, and should only be used when needed. Instead what you need is a sponge soaked in water. You wipe the soldering iron tip to clean it. Instead of sanding the surface, you need to use flux. Flux is a substance you apply before soldering, it allows the iron to heat the solder surface, such as the 18650 battery.

Great Job. Thanks

Just make sure you do not spend too much time heating up the 18650 battery tops.

so useful sir thanks

Hmm risky.... make sure to never heat up the terminals at all, just touch and go, better to use spot welding.

Whoa nice, I did not know you can solder 18650 like that ...

What's the temp of your soldering iron sir?

Man did a 10minutes video to show u how to solder improperly. The wire goes inside the solder, not on top of it.

If you are probably tinned, you cab on the battery and off in 1 1/2 seconds

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it puts the lotion on the skin and does what it's told...... put the soldering flux on the metal before applying solder.... your just vaporizing it with your hot iron

Solder iron heat adjustable you use

Has anyone put the battery in the freezer 1st ???

Used flux every dang time yet has no clue it makes the scratches a moot point and a detriment of anything

No matter what I do I can't get the solder to stick to the battery

Only safe way to solder to an 18650, is NOT too.

Not a good idea to sandpaper the metal and then leave oily fingerprints on the surface. There are cheap spot welders out there made for the job - $15-$20.

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I just tried doing this and the battery EXPLODED

That is a verry bad way you put 5 times heat on the battery , you should go in one time lots of heat but verry short and why cut the wire and then soldering an other wire ?? beats me man , better learn first how to do it wright befor making a how to

Almost all he is saying is not the way I do it. 1. I use 220 grit to remove the oxidation from the battery surface then a q-tip with a little rubbing alcohol. 2. I use a liquid flux made for stainless steel applied to the battery not the iron 3. I use the exact same soldering iron and tip that he used on the 400 degree setting. 4. I put load up the tip with rosin core solder and in a quick motion rub it on battery surface. It only take 1 second to tin the battery and no going back again and again as he did ending with a cold solder blob. The solder should flow to a thin nice shiny surface. 5. Blowing on the battery does nothing to lower the damaging heat in the core of the battery. 6. When I connect with nickle strips that have been prepared with 220 grit sandpaper,alcohol and stainless flux (like the battery) then I tin the nickle strips. Tin both sides if you are going to add more then on nickel strip for extra connections. Let is cool then holding strip very near above the battery surface apply the iron to the back side of the nickle strip on the opposite side from the tinned solder when it melts quickly move it on top of the battery with the iron for 1 second. 7. Allow several minutes for the battery to cool between steps.

How to make a bomb

Notice how the flux instantly evaporated into smoke? 😂 Bro doesn't know how to apply flux

Do. Not. Solder. 18650.

You did not connect the nickel strip to the battery, you connected a wire to the battery. This is a very dumb video.

NEVER solder to an 18650 cell. This will at best reduce the power density of the cell, and worst case scenario, will cause a fire, or explosion.