This is just an informational post. My battery finally died after 5 years, so I'm trying out a start/ stop lifepo4 battery from Amazon. Only issue no one sells group 34/65 that'll be dropped in. I went with group 47 battery which is slightly smaller than 34/65. Only issue is the posts are opposite. I turned the battery 180° & lengthen the cables to reach the posts again.
The width of the battery is shorter also so the battery clamp won't work. I 3D printed a larger out of ASA. Hopefully it'll last with all that heat under engine bay.
Anyway, so far the engine starts right up. Since this is play toy, I only drive it once every few weeks to keep battery charged. Now I'm gonna try to see if I park it for month, if battery will still be solid. Also it seems the idle is slightly higher rpm so jeep doesn't shake as much as before.