Ijust 2 question.

Hello. I hope this is the right spot for this.

I have two Eleaf IJust 2 Minis purchased at the same time from the same source. Independently they work fine.
I cracked the glass on one of them and thought I would just use it as a battery backup and switch the tank when one died. However, whenever I take the tank off of one and put it on the other, the coil burns out. Is this normal?

Welcome to VU!
Nope. You should be able to switch any compatible tanks from/to any compatible mod, without burning up the coil, unless the settings in your mod is wrong.