Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
I would say it is likely not safe, I suspect you would fry the battery charging regulator, which is not cheap (around $100 new on ebay).
Note it is safe to run a MEP-016D without battery since it has no charging system
Ike