I also use the Ecolink Tilt (mailbox too), only had issues in the cold Buffalo weather, but did the 2 x AA upgrade and never an issue since, as a matter a fact the Batts are still at 100% and starting on their 2nd winter. Those standard Batts are very poor in the cold, very low mA rating.
ebay cheap, got two open boxes some time ago for just under $20 ea. New for $25-29. If you are messing around with other sensors or workarounds you are wasting time, spend the 20 and get it over with. Interfaces perfect with myqlite.
Don’t mess around with the double sided mounting tape either, see link below. Pack AA Batts in box and mount to frame on door, the supplied tape falls off in cold or over time…