I got a used Metz 60 CT-4 from B&H, and I am confused as to what kind of battery it has in it. It is supposed to be a dryfit battery according to the item description on the invoice. But the battery compartment has the small metallic pin set to NiCd. the battery itself has nothing written on it (it has what looks like a serial number "AC257GK2" - but no other markings). I'd like to charge it, but don't want to damage it by using the wrong settings. How do I tell which kind of battery I really got?