While tinkering with the map on my GSXR1000, with a Yosh. EMS, I needed a 9 volt battery. I found several around the house but they were no good. I grabbed my handy JR XS3 RC controller battery pack and installed batteries. The connection is the same as a 9-volt battery. With alkaline batteries that is a 12-volt total.
Everything worked well. It's difficult to find batteries late at night.
I'm just passing along information that some of you might be able to use.