DISCLAIMER: I am not responsible for any injury and/or damage from anyone watching this video.
Please follow my instructions at your own risk.
Soldering 18650 can be dangerous because lithium-ion batteries are not heat tolerant and they can explode or combust by fire.
How to solder 18650 batteries safer and more careful:
Step 1: Make surface rough using sand paper or utility knife.
Step 2: Add blob of solder to each surface first
Step 3: Combine and melt both solder blobs together quickly
Please be careful using this technique, the key is to NEVER heat-up the battery too much.
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