[s-cars] '95 S6 Remote locking - key damaged and/or inoperable system. Trouble shooting?

[Tom Winter]

Hi all - for those who lurk on the main quattro list you've seen my posts
regarding my 5000tqa. But I'm new here, having just purchased a 95 S6 avant.

Here's the deal: 

The key with the remote was broken in half (it came that way with the car).
Let me describe: Imagine trying to pry something in half with the metal part
of the key. Metal key gives way, leaving twisted stub attached to the
plastic "head" of the key. I do not know how this happened.

I've replaced the batteries in the head of the key, but the remote doesn't
work. However, the owner's manual didn't specify exactly what battery model
should be used. The ones that I installed are Energizer #386 @ 1.55 v each.
Wrong? If so, what is the correct battery?

If the remote is kaput, I'm wondering about replacement options. Ie
trouble-shooting the system and a replacement key (which, I assume is a
stealer-only part)

Thanks in advance for the input.

Tom