Fridge / Freezer temperature monitoring / sensing

[RBoy (www.rboyapps.com - Making SmartThings Easy!)]

@iridris

Batteries don’t like freezing temperatures

Alkaline batteries are range bound in temperatures. Lithium batteries perform quite well even upto -20C. You can find the charts and a write up about battery chemistry v/s performance here:

[RELEASE] Low Battery Notification with Customizable Alert/Warning/Monitor, Configurable Thresholds and Device Monitoring Alerts

Some interesting notes we have gathered about different battery types (also included in the first) and their impact on devices: See how the battery stability (voltage) varies by load and temperature, lithium batteries have the best stability: [image] [image] [image] Lithium batteries come in voltages from 1.5v to 3.7v, check the correct voltage before using Not all devices are tuned to handle the voltage curves of rechargeable (NiMH) and lithium batteries, adjust your thresholds accordingly (e.g. devices with alkaline batteries expect a gradual voltage drop off where as lithium batteries voltage drops very quickly at the end). Conversely NiMH batteries drop off very quickly at the beginning which may cause some devices to shut off or report lower battery levels The last point is inte…

You can get AAA and AA Lithium 1.5v batteries from Energizer on Amazon. If you’re operating at low temperature or high load, these batteries will outperform alkaline batteries on a $/mah delivered basis over the life of the battery.