Contact sensor battery replacement still dead

this is a documented design flaw. they will replace these if under warranty. but for a full proof system you have to either get their v2 or go with another vendor.

Can you point me to where Wyze indicates this is a “documented design flaw”?

https://wyzelabs.zendesk.com/hc/en-us/articles/360047594431-Sensor-isn-t-connecting-anymore-after-changing-the-battery