It's always a thing with the official online shops of the manufacturers. In many cases, the prices there fall less quickly and are generally somewhat higher, which results in something like this.
I don't know the problem, but apparently the batteries are activated the first time they are charged. You should charge them individually, i.e. remove the plug from the multi-charger and connect it directly to the battery. This may also apply to older models, but it was not necessary for me. If this does not help, you will have to contact support.
Now I can answer the question myself :-) In stock and about to be ordered. Nice, yesterday the date was not yet known. This morning, May to June was switched on and now the items are in stock. I am happy!