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Sun 2021.05.23
'how long would the battery last'
I found the specific answer for Bangle by taking a peek at the Bangle presentation page:
Below the Power Consumption heading are the measured current draw values.
See the following section on how to calculate an estimated duration with a brand new battery.
post #2 Battery life of Bangle J.s - in real world situations
Also understand that advertising interval, transmit power output and sleep durations need to be taken into account, along with number of times polling the temperature sensor is performed.
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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.
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Robin
fanoush
@HughB
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 ?