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IMO outside temperature sensor is a waste of a Puck, you can get very cheap LYWSD03MMC thermometers (example https://www.aliexpress.com/item/4001095735569.html )
They are hackable with custom firmware available. Got one outside since autumn last year and it still works with first battery. It also survived winter without issue (someone also tested it in the freezer -20C).
There is a thread about them here, you can certainly read them from bangle.
fanoush
If I wanted to make a puck into an outside temperature sensor that I could read from my Bangle - how long would the battery last in the puck before it had to be changed if all it was doing was measuring outside temperature and supporting a bluetooth connection to the bangle watch when in range ?