beocom 6000 questions (power supply, batteries...)

hello,
i just bought a beocom 6000/beotalk/beoline bundle and i need some help  in order to pair all power supplies (the problem is their voltage)
Here is a complete list of all the items

4 handsets
4 pyramid bases, all with status leds (no power information on the labels)
1 beotalk 1100 (no power information on the labels)
1 beoline isdn (label says dc 7.5 v )

6 power supplies:
 -4 look exactly the same (label says: ontop model a30750g class 2 output 7,5v 0,5A)
 -2 look exactly the same (label says: ontop model a30930g class 2 output 9v 0,3A)

I thought the four 7.5V power supplies were for the pyramid but, according to the labels, one of them is for the beoline !

I would like to know if there are compatibility issues between germany (where i bought from) and italy.

The menu structures is slightly different from another beocom 6000 i already have (some kind of "total cost" voice is present, and there isn't the "language" options); is it due to an old firmware ?  would the update give important improvements?

And, as three handsets need battery replacement, i wonder if you have some advice about where to buy new ones (and which models), because as far i can remember at the official dealer it cost me about 30 euros!

Thank you all for helping
francesco

I can confirm that the a30750g power brick is for the pyramid charger base.

I will look this evening to see what the ISDN base station uses.

regards

Tim