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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!

Thanks Matt. Those pics are really helpful.

How about this one? It's 25 x 47 x 138mm, 25C instead of 20C, 4200 mAh instead of 4000...and $20.56 instead of $33+.

https://hobbyking.com/en_us/nano-tech-4200mah-2s-25c-hardcase.html

this one is a good fit width and height that coelacanth listed above. problem I have in an rc10 chassis is the large 12 AWG wires exiting from the end, the wires crash into the servo and arm. this would be a superb pack if the wires exited from the top, which I think they make one just like that but not sure the part number.

Oh, I found one that should fit if the others above do:
https://hobbyking.com/en_us/turnigy-4000mah-2s-30c-hardcase-pack-roar-approved-de-warehouse.html

Pack Size: 135 x 45 x 21mm

DOH! this is the same link aconsola posted.

No worries, I'm glad you posted that link! That one is quite small, and a great price too. Thanks!

I have found a few by searching Tamiya Lipo. I needed some for Wild Willy and M03 Mini Cooper. They are 6 cell with cells arranged vertically to fit old and a lot of relatively newer Tamiya stuff. Venom above is what I found, beat me to it.