Monthly Archives: December 2014

Pinoccio Project #3 – How cool is your Pinoccio?

My freezer has a bad habit of icing up.  It’s not a great design to start with and I suspect I’m overfilling it, but I wanted to check whether it was getting down to the right temperature and also whether the defrosting cycle was running properly.  A Pinoccio is an ideal thing to check this with, the only problem is Lithium batteries don’t like working in cold temperatures.   At -20°C the chemistry inside the battery is finding it really tough going – after a short trip into the freezer my Pinoccio’s battery was reporting 4% even though it was fully charged moments ago.

There is an alternative though, a supercapacitor.  Capacitors don’t particularly care about the cold since they don’t rely on a chemical reaction.  Capacitance is simply an electric charge difference between two conductive plates that are close together.  Supercapacitors with an industrial temperature rating (-40°C to 85°C) are quite common.

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