batteries in low temperatures

Hi I have a thermometer with a remote wireless sensor, Oregan RAR621. I noticed that the lowest outside temperature recorded was never below -4 0C even although my old min/max mercury thermometer said otherwise and have discoverd why. The sensor does not send a signal at low temperatures because, I think, there is not enough power in the batteries.

So what are the best type of batteries (AAA) to use in a wireless sensor subjected to low temperatures? Thanks Ron

Reply to
Rocket Ron
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That happened in my digital camera when I was out photographing a Lunar eclipse. That used Lithium Ion cells and stopped at -2 deg C.

Can you run two power wires back into the warm but keep the sensor box outside.

Chris.

Reply to
mcbrien410

Alkalines lose their ability to deliver significant power below about

0 deg C, and so can't power the transmitter to a sufficient level.

Consider using NlMH rechargeables for the winter season; they can operate down to about -20 deg C and in the low temperatures of winter self-discharge only slowly. They'll need to warm up naturally to room temperature before recharging, though.

Reply to
Zaru Bezh Naya

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