Yes but very carefully and very quickly. Soldering Li-Ion batteries like 18650 and 21700cells 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. If you are using a. Yes. When soldering lithium-ion batteries, the cell almost always gets damaged to some degree from the intense amount of heatemitted by the soldering iron. The only thing you can really do is minimize this level of damage, never. Soldering lithium-ion batteries is generally not recommended because the heat generated by soldering can damage the battery and potentially cause a fire. If the battery must be soldered,. Again, you really should not be soldering lithium-ion batteries unless your project has specific requirements for it as it can be dangerous to you and the cell. If you absolutely have to, here is a general overview of the steps. It takes a great amount of care and skill to solder lithium-ion batteries. You can't just learn how to do it on your first build. That is just not going to be possible. This is because the type of soldering that needs to be done to -and it's.