I have a "second wave" Bangle, which came with the little piece of tape covering the two central contacts.
However, after I while it came off, so I replaced it with another cut which succumbed, as well, after a couple of months.
I'm a little bit worried since the two outside pins are starting to oxidize and, as it happened with an Amazfit watch, this can make impossible to charge the device.
Now I painted the contacts with a laque, but I wonder if there any way to solve this issue one for all.
Also, is the voltage on the two central pins somewhat related to CPU activity? Because after using the watch with an app which I developed, continuously running in the background, it seems that corrosion has kicked up after a day or two.