nice!nano possibly shorted?

Hi! I just received a nice!nano (Order TA20687), and I soldered it to my board. I double-checked, and no bridges were seen. Once I plugged the board in, however, I heard a crackling from the controller and an audible pop, followed by smoke rapidly coming out of the battery that was lodged underneath. The battery has a burn mark on it and had that sweet smell of acid coming out from it. After I made sure everything was cooled down, I plugged the nice!nano into a computer and confirmed it was dead. What opinions might y'all have for what happened?
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nice!nano possibly shorted? - Typeractive.xyz