Oldest Working Battery In The World?

I've been married for 34 years and definitely had this Remington electric razor before then. I hate electric shaves so it only gets used for about 5 minutes when I don't have time to shave 'properly', i.e. with a Gillette Mach 3, so probably used 2-3 times a month. Other times it just sits plugged in, fully charged for 95+% of the time. This isn't the recommended regime for rechargeable batteries, never mind one of this age, but it holds its charge just fine and the shaver works as well as ever it did. Unsurprisingly I tend to treat all other battery powered devices the same and I only wish my printer inks showed such longevity

 

Interesting battery tale because my grandfather had what was an expensive at the time large sized rechargeable transistor radio from 1959 or 1960 and it also lasted and lasted.........in fact it outlived my grandfather by over twenty years and almost outlived my grandmother into the mid 1990s. If nanna hadn't dropped it on the concrete path when she was taking it into the garden (to listen to the ABC), it would probably still be going strong. I had a look to see if I could fix it for her but it had a very early design printed circuit board made of lacquered compressed cardboard and the battery had split open and the electrolyte had seriously corroded everything and it was unrepairable. The battery was a very early type of lead acid gel cell but the gel was really a thick but still runny liquid and very corrosive sulphuric acid. The battery case had been ruptured in the fall and the sulphuric acid spilled onto most of the electronic components and switches. When dropped we estimated the radio to be about 34 years old and had been used several times every week for its whole life.
The on off switch, the volume control pot and the recharge jack had all worn out by the early 1970s so nanna took it somewhere and they fixed the switch and volume control and they put a new lead on it but they couldn't match the ancient charging jack so they direct connected the replacement 240V lead to the internal battery charging circuit and nanna used to just roll up the lead and tie it with a ribbon when she took it out to the garden.
Seems they built that radio to really last

 

Back in them day's stuff was meant to last they where more worried about quality then quantity.In today's market it's about quantity and most places could care less about quality.

I have my dad's washer and dryer we bought them about 10 years ago.Still run's like it's brand new.

 

I have an old double-sided razor stored in a coffee can with some old 2-bit (.25$) memory cards from around '88. Worked last time I used it... around about '88.

 

[QUOTE="Earthling, ... ... ... ... I only wish my printer inks showed such longevity [/QUOTE]
No surveys have been made, shall be made ,of the worlds population, therefore the oldest working battery shall NEVER be known.
Any questions?
(Aside; the oldest known working battery is a different subject.)