[SpudRider]

My Honda XR650L came equipped with a YTX9-BS/ETX9/ES9BS battery, which has the following specifications.

http://www.autozone.com/miscellaneou...ery/350076_0_0

YTX9-BS Battery

Size: 6.0" x 3.44" x 4.19" (6" x 3-7/16" x 4-3/16")
Amp/Hr: 8.0
C.C.A.: 120

If your battery dies while traveling, and you need an emergency replacement, this battery is frequently stocked by Walmart, AutoZone, and O'Reilly Auto Parts.

http://www.autozone.com/miscellaneou...ery/350076_0_0

http://www.oreillyauto.com/site/c/de...0058&ppt=C0393

https://www.walmart.com/ip/EverStart...ttery/16795218

This battery easily cranks the much larger engine in my Honda XR650L, so I am sure it will also easily crank the smaller engine of the Zongshen RX3.

The dimensions of this battery are almost identical to the YTZ12S and YTZ14S batteries; the ETX9 battery is merely 3/16" (5 mm) shorter than the other two batteries.