Salvaging batteries

So over the last week or so, when I've had some down time, I've been playing with old batteries.
It's been an amusing experience, such that I did a little writeup of it for those interested.
I won't spoilt the ending but as ever, 'buyer beware'...

https://terravolt.co.uk/solar-battery/the-100-givenergy-battery-challenge-part-1/

I saw that one advertised. Glad it has provided you some entertainment, and me some further understanding of what makes up a battery.

Thanks for sharing and the exploration as it helps educate folk so imo very useful...