wrote in message
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I just found that they are selling calipers on Aliexpres which have
a small solar panel to power them. And they also have a battery to
power them when used in poor light. Some use LR44 batteries and
some use cr2032 batteries.

And some are stainless steel and some are carbon fiber.

And my question is whether the carbon fibre one will last under
light usage? And will they stand up to being used every day?

And any comments on which battery is the one to buy. The lithium
battery is a higher voltage and that could be a problem with a solar
cell meant to be used with a 1.5 V battery.

Dan

Each individual Silicon solar cell produces 0.6V (the forward diode
drop) so there have to be several in series to charge -any- battery.