On: Best-selling Zigbee temperature sensors tested and compared

[zimpenfish]

For me, the Zigbee ones (generic ones from AliExpress) have been great inside both fridge and freezer. Bluetooth ones occasionally dropped off (and were much worse re: battery life.)

[guillem_lefait → zimpenfish]

What happen to the batteries when inside the freezer ? Sensors seems to be fine at -20°C, but is it the case for standard AAA or CRC32 batteries ?

[zimpenfish → guillem_lefait]

I can't speak as to what happens with the chemistry but the Zigbee sensors do seem to be fine on standard (not rechargeable) AAA batteries at ~-18ºC.

Rechargeables were worse for me and thus I haven't used them at low temperature for a couple of years - maybe things are better now.