As you can see the mailboxes in the cold normally kill the small watch batteries… @shaun_barrow you said working good for 2 weeks and battery already down to 77%, were these new batteries when you started?
With the AA conversion (over 10x the power capability), my haswent thru an entire winter cycle in Buffalo, actually about 13 months and it’s still at 100%. The little watch batteries get eaten alive with the cold and the additional updating to keep the temp, plus not a cheap replacements… Just something to add to you decision when deciding what unit you get. For under $28, the TILTZWAVE2-ECO has performed great in the cold, for about $1 at Home Depot for an small plastic electrical box and about $.75 on ebay for a AA Battery holder, I haven’t touched in over a year, including a very harsh winter last year.
http://www.thesmartesthouse.com/products/ecolink-garage-door-tilt-sensor-tiltzwave2-eco_02