The manufacturer part number for the battery is 15085, which is what it listed on the tower hobbies site. I'm amazed they haven't fixed the description yet. Anyway, the battery dimensions are 5" long x 1-7/8" wide x 1" high. Its a nice snug fit right into a Jrx2, even with the original, early battery cup.

I also just noticed that the dimensions in mm are listed on the battery label. How extraordinary!

Matt
Just a part of my RC collection:
Matt1ptkn's Toys
"I wish there was a way to tell you're in the good old days, before you've actually left them."