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From: Piotr Piatek <piotr433@pisi.com.pl>
Newsgroups: sci.electronics.components
Subject: Re: Mysterious part in an old calculator
Date: Mon, 18 Apr 2016 14:48:29 +0200
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Xref: csiph.com sci.electronics.components:5968

Thanks to all who responded. The device is indeed connected across (i.e. 
in parallel to) the power supply pins, so it cannot likely be a low ohm 
resistor or a fuse. It appears to be a tantalum capacitor. The measured 
capacitance is about 4.75uF. Photo taken after removing excess solder 
with wick:
http://www.pisi.com.pl/piotr433/misc/bluething2.jpg