OK, I should research this more thoroughly before starting a new thread, but we are on a tight-ish schedule.
My son has been asked to test some big 2v cells. I have one photo to go on. (Below)
There's one in the foreground with a split case (the one with the green strap on it). I'd probably call that one unserviceable.
Some are flooded lead acid with clear cases. These you should be able to visually inspect and verify the sediment in the bottom has not built up enough to short the plates, check the plates aren't warped and touching, charge them and test the electrolyte for specific gravity.
Not sure of the others, if they are flooded lead acid, could charge and test the electrolyte S.G.
How to test them if they are AGM?
I'm assuming the blue top ones are 2V, but they have two breather/filler caps, so maybe they are 4V.
What is an acceptable load to test whether they can deliver? Eg, is it C20? i.e. a 1000AH cell should deliver maybe 50 amps?
Any gurus who can propose a relatively scientific charge and test protocol?
Does anyone recognise tem?
Frankly, they look too neglected to me.