I don't mean to yank the conversation topic in a different direction however the talk of battery preference & dependability + how important having reliable ( or redundant ) batteries compels me to mention this. I didn't want to add the weight of a 2nd battery & couldn't stand the idea if being someplace ( pre-GaTR membership) alone & without some CCAs , so I carry one of these.
https://no.co/gb70It has more than paid for itself , particularly with the older XJ and YJ , not to mention others . Some of you might have seen me air all four tires up after wheeling with only it powering my compressor. I can run my rocklights with it or KK & I can charge our cellphones while we sleep in the tent w it.
The thing could jump every Jeep in the club on a single charge. It'stored in the rear cubby . There's cheaper Chinese ones but this is a cool product for backup to your batteries ,fwiw.