This shouldn’t be an issue during normal operation (just datalogging should use very little current on average), but if someone wanted to read it out over the optical interface in the Arctic, it may be another story. Some wild guesses at the reason behind the unusually high voltage:ġ) High-current operation at very low temperatures. A single 3.6V cell will easily power a 1.8-3.3V device, and maintain this output voltage until nearly depleted. Now, in an industry that is constantly pushing toward ever lower voltages to reduce power consumption, this is weird! Especially for a gadget that needs to go a long time without a battery change. The battery pack consists of two series-connected Tadiran lithium primary cells (AA size), with a nominal 7.2V output. High-temperature overlays and even double-stick tape exist, but it’s pretty fancy stuff. This and the overlay sticker on the front suggest this device is intended for enforcing low temperatures. A piece of foamy double-stick tape helps hold and cushion the battery pack where it sits against the PCB. The battery pack is Zip-tied to the plastic “cage”, although not to the PCB or any part of the case. That piece of double-stick tape really ties the room together.
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