A bit of fun again... was sorting some more... was into wire/electrical stuff... found this old 9V rechargeable battery !
A beautiful Varta. Yes I know the yanks shit on them, but in Western Europe they make good ones.. they only send you the crap ones.. or maybe Varta has a plant in the US or Mexico just for your market and has substandard quality control there, I don't know...
Anyway, there is not even a date on that battery, but no need : it's the only 9V rechargeable battery I ever bought, and I still vividly remember buying it, as a teen, in the local electronics shop. Had to save for a bit to buy it, was so thrilled... said on the tinu it can recharged 1000 times wow... I was in awe of this thing, was the future for sure.
So it's at least 30 years old, maybe 32 I don't know.
I think I used it... never, not even once. But I was happy to have it anyway !
So, will I get my 1,000 cycles then, 30 years later ?
I measured voltage... can't believe it, it still registers something ! 2.5V !
The wonders of electro-chemistry I guess... not my part.
OF COURSE I had to see if it would take a charge !
Because why not... just for fun, to see what would happen..
This is where I am starting to like my lab coming to shape, though I am nowhere near done at all, not even remotely.
1) Sit your butt on this comfy rolling chair.
2) in an eye blink, roll it to the right, to get to drawer unit.
3) Open relevant drawer
4) marvel at the fact that you have crocodile test leads right there, at your finger tips, easy to get to.
5) close drawer and roll chair back to the left where the lab supply is.
6) marvel at the fact that you can actually SEE the surface of the bench ! No longer covered by a thick entangled layer of various test leads, hand tools and soldering related equipment and supplies, among many other things.
7) in an eye blink, wire up the battery
8 ) sit back and enjoy.
Can't wait for the lab to be fully operational, I am already starting to like it a lot...
Battery label says it's a 9V but back then that meant it really was 7.2V (6x1.2V cells).
Up to 10V charging voltage, it takes zero current.
At 11.5V here, it takes about 50mA.
I will leave it like that for a bit see what that does... will it revive it a bit ?
My bet is the 50mA aren't charging anything at all... must be just a DC leakage current due to the severe state of chemical decomposition this battery must be in ?!