Woodstock battery modification

[Adam Vaughn]

IMO, those capacitors should be replaced before you use that calculator much longer. They look rather old, and electrolytic capacitors don't have an indefinite lifespan (often 10-20 years, sometimes 30-40 if you're lucky). Use values as close as possible to the existing caps, to be safe. Might not be a bad idea to replace the diodes, while you're at it. Make sure to match the polarity of the new parts to how the old ones were wired in.
-Adam