Battery compartment size
OK, I got to open up the battery box today and get some measurements for everyone:
View attachment 829
This picture shows the top of the battery and the hold down clamp. It is hooked on the left hook, the lower of the two available. The higher hook is 1/2" higher than the one currently connected. The bottom of the battery box is made with a 1/2" deep recess made to fit the length and width of this battery so it nestles down in the recessed area perfectly. My battery is about 5.5" long, 3.5" wide, and about 7" high.
View attachment 830
This picture shows that the bolt in the hold down strap is in the lower mount. This is the one to use for the smaller OEM battery. If you want a larger battery, put the hold down strap on the higher hook, and used the higher mount to bolt the strap to. A battery with dimensions of about 6-7/8" long, just over 6" wide, and up to 7" high should fit in the bigger section of the battery box.