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100 batteries arrived

A project log for Low-cost/power/size temperature logger

A low cost ultra-low-power small-sized high accuracy temperature logger for use in scientific research.

NikosNikos 03/13/2018 at 09:022 Comments

One of the sweetest aspects of using a CR2032 battery is the price you can get them for. Sure they're a couple of euros/bucks at the local store, but because of their popularity you can get a sweet deal from distributors.

Because of their fire hazard (technically) serious distributors will only ground-ship them, so my best, and as it turned out quite good, option for Greece was tme.eu . I got 100 batteries for just €23 plus €7 for ground shipping.

Not bad for a bunch of Varta coin cells that should each run a logger for more than a year, and Panasonic or Energizers aren't far off.

Mind you, I also bought a bunch of no-name coin cells off eBay a couple of years ago, but most of them were discharged even before I used them. To be fair, bad storage on my end was partly to blame for that.

I'm looking forward to start deploying these with the loggers pretty soon!

Discussions

Ted Yapo wrote 03/13/2018 at 12:11 point

What is that caution symbol?  Don't power humanoid robots with this battery?

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Nikos wrote 03/13/2018 at 16:37 point

Probably good advice, but in this case it's a hazard warning. A swallowed coin cell battery can stick to the esophagus lining. Because the two battery poles are very close, an electrical current flows through the lining and can cause a circular burn. In (I believe) two cases it has led to death. This can occur within two hours of swallowing. Children are especially vulnerable because they are prone to swallowing objects and they may not report it in time for an adult to seek medical care. Anyone swallowing a battery should go have it removed (at a medical facility) as soon as possible!

I'm already preparing a manual for the loggers and have a couple of hazard warnings on the cover!

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