Soldering lithium batteries without a spot welder

Can you solder directly to a battery?
Yes but very carefully and very quickly. Soldering Li-Ion batteries like 18650 cells puts a lot of excess heat into them during the soldering process. This extra heat does a small amount of damage to whatever cell it gets to. The longer a given cell or cells stays hot, the more capacity they will lose.
#lithiumbattery

[@chimaeria6887]

How do you expect to solder properly with that oxized solder tip?

[@CONTRIVERC]

🤣 But it worked 😅

[@robrablz]

I use acid flux to solder tin before performing soldering.

[@VitorMadeira]

The odd music os totally useless.
Ouch!