Call and order by phone - but the old one in picture 2 is probably no longer available, as it has a different name (AL 3620 CV).

Both product images show the AL 3620 CV model. One shows the older model and the other the successor model. As both models have the same number, it is possible that a new or old model is supplied.

This charger is designed to charge 36V batteries only.

No, only the charger.

I can't answer that. I use it to charge the Li-ION batteries (36V, 4.0 Ah, 144.0 Wh) from the Bosch lawnmower. They fit on this charger. Caution: The device and battery must not not get too warm when charging (do not charge in direct sunlight)...

Thanks for the info! However, this is the question function. You can write a review here: https://www.galaxus.ch/de/s4/ProductRating/NewOrEdit/3520567