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Battery Drain: "Tiny pieces of tape that hold the battery components together are made from the wrong type of plastic" (PET)
@lupyuen The two papers explaining the process can be found here:
https://iopscience.iop.org/article/10.1149/1945-7111/acb10c
https://iopscience.iop.org/article/10.1149/1945-7111/acaf44
@lupyuen D'oh!