I kinda like the car battery referenced earlier in the thread, like Tim Taylor more power
When talking batteries and cranking power that will never hurt if you need your tractor in the winter. As in anything electrical it doesn't matter how many amps are available, it will only ever use what it needs. But in the cold a battery isn't as strong as when warm. Add thicker oil and a likewise cold engine,

Glad I was some help.
The battery in 100 is a NAPA Legend battery.
Specs are
cold crank amps @ 0 degrees-580
cold crank amps @ 32 degrees-725
Napa part number-7558 N

It looks like you need a similar battery that my Gravely uses,,
I made the hold down,,, a piece of all-thread and a piece of rod,,,

https://beta-static.photobucket.com/...ps5bff237a.jpg

What group battery is that cad?

That may be a Group 34,, I use a lot of those,,,
the trick is to get a battery that fits in the box,, and the posts are on the correct side,,

AND, actually, that is a bigger battery than the Gravely 5665 calls for,,
but, that big battery and tractor is a nice self propelled "jump cart",,
so i put the biggest battery in that would fit,,,

That battery can jump anything I own, including the diesels,,, :biggrin2:

One of my Ariens gt's came with a group 51 battery in it, but it was ancient, over 10 years old, this tractor had sat in the weeds abandoned for a long time before I got it. So it was shot and unsaveable by then. A group 51 used to be used in alot of Honduh cars (NOT a fan of that brand in the least, nother story) also a woman that I know who raises, boards, and shows horses has a newer NH CUT with the same size battery as stock.
But a 51 is only slightly bigger than a U1 and as a car battery, can be had with more CCA than a U1. Another possibility.

So this is what I went with. Thanks to all for your responses.

Sorry, I forgot the picture

Boulder is that a group 22F?

The battery and receipt both say MT-26