Ok, this makes much more sense, thanks. Essentially, the device goes into a test mode for 2 hours after pairing (which is when the battery isn’t reported in the DH). After 2 hours, it exits the test mode and the DH fully pairs, but the reset interval goes from 5 seconds to 60 seconds.
If only we could figure out how to keep it in test mode.
I let Google translate the FAQ. Here’s the description of the test mode: