Battery draining way too fast on temperature sensor

[AndrewG]

Hi,

When I first got the Wireless Temperature Sensor a couple years ago the battery on it lasted for about a year. The last few times I've tried using it however, the battery has only lasted a couple of weeks. I thought maybe I had a bad batch of batteries, so I ordered some Nightkonic batteries that seemed to be the recommended ones. I track both temperature and the sensor's voltage, so you can see how quickly the voltage drops after replacement in the attached screenshot.

Any suggestions? Is my sensor defective?

[woo...@gmail.com]

I am experiencing the same issues with Energizer CR2032 Lithium batteries. The sensor in the hot wiring closet lasts seeming years while the freezer sensor runs down in about a week. Is there any particular brand or type of 2032 battery that is better suited to cold environments?

[Glenn Seaton]

That is not what I expected, I had not see that differences between Fridge and Freezer so my testing was at room temperature   

I used the Energizer for years before running my test on batteries and it worked find in both Fridge and freezer.

To be sure, I will repeat with a set of batteries in the Freezer and find out.

[Steve Fry]

I'm seeing a fairly rapid deterioration with my temp/humidity sensor as well. I converted it to use

two rechargeable AA batteries (Sony Eneloop) but it still doesn't last very long. I just put in a pair of recharged

batteries a few days ago. It sits in my living room, so should be temperature stable.

For reference, here is the BATT report from syslog from the last two days:

Aug 14 00:51:02 raspberrypi-radio serial_box_monitor.py: a12BATT2.40-
Aug 14 01:43:10 raspberrypi-radio serial_box_monitor.py: a12BATT2.40-
Aug 14 02:35:18 raspberrypi-radio serial_box_monitor.py: a12BATT2.40-
Aug 14 04:19:34 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 05:11:42 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 06:55:58 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 07:48:06 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 08:40:14 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 12:08:46 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 13:00:54 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 13:53:02 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 14:45:10 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 15:37:18 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 16:29:26 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 17:21:34 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 18:13:42 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 19:05:50 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 19:57:58 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 20:50:05 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 21:42:13 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 22:34:21 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 14 23:26:29 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 15 00:18:37 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 15 01:10:45 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 15 02:02:53 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 15 02:55:01 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 15 03:47:09 raspberrypi-radio serial_box_monitor.py: a12BATT2.29-
Aug 15 04:39:17 raspberrypi-radio serial_box_monitor.py: a12BATT2.20-
Aug 15 05:31:25 raspberrypi-radio serial_box_monitor.py: a12BATT2.20-
Aug 15 06:23:33 raspberrypi-radio serial_box_monitor.py: a12BATT2.20-

Steve

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[Gadjet Nut]

Lithium batteries should be ok in freezer. Did the temperature of the freezer get turned down below -40C? Unlikely. Operating temperature is -40C to 125C for CR2032 and -40 to 85C for the CC1110 chip. 

Another option is to have the radio outside the freezer:  

https://www.jemrf.com/collections/rf-sensors/products/waterproof-wireless-temperature-sensor

On Aug 15, 2022, at 12:50 PM, Glenn Seaton <glenn....@seltron.com> wrote:

That is not what I expected, I had not see that differences between Fridge and Freezer so my testing was at room temperature   

--

[Jeremy Green]

I assume these perfom the same as CISECO XRF's are you sure you are sleeping between readings rather than just cycling.

Im guessing its correct as you have a BATT every x readings which in your case is about 45 mins.

Whats your TEMP cycle? 5 Minutes?