Cheers for the replies, interesting topic.
This is more out of curiosity than anything else, but tbh I think this one is not recoverable.
Pulled it from the car today, even after a two day charge not enough juice to wind down a window, volt tester showed 11.3v.
Once on the bench it looked as though one of the cell chambers needed topping up, duly did so with distilled water and whilst it did take maybe 100ml the translucent white area stayed as per photo.
The rest of the cells appeared fine but with some powder sitting on top of the fluid - sulfate? (spelling 'sulphate?)
There was probably enough juice for the smart charger to recognize so hooked it up along with the gizmo to see what happens.
Gizmo
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