Personally, that would have been one of the first updates, I would have performed!
Any suggestions? Memory card battery is old but still reads 3 volts.
IF that battery has never been changed -- at > 25 years it is well beyond its design life (10 years).
Less headaches and worrying in future -- update to modern technology -- and no future issues or battery replacements.
In 2005, a TS-440SAT that I refurbished still held its memories -- BUT the battery had begun to leak.
Fortunately, I automatically checked it (and found leakage, which is thh radio's uP control board).
Cleaned up battery acid -- no damage to PC board traces, YET.
New, fresh lithium coin cell installed.
We keep moving forward, opening new doors, and doing new things, because we're curious and curiosity keeps leading us down new paths. -- Walt Disney