Hmmm....
I have just discovered that mine is the old Proteus Explorer Pro 14.
It's the one where two SLA batteries go into.
They are joined together with plastic disc - just to stiff them up.
I had to change the batteries some time ago and I couldn't find a new plastic disc. (I have recycled the old one).
New Proteus is different.
But the charger still takes up to 30 hours to charge the batter full.
It would be useful to get a spare set....
Mac