18 JLUR battery questions

[Shadowrott]

My 2018 JLUR 3.6 with 30k miles starts fine with ignition push button start. But when I use remote start it acts like dead battery either clicking or cranks slow for a second and stops. If I drive for awhile remote start works but after sitting overnight same issue. Batteries are original, Jeep was ordered from factory delivered May of 18.
So is my auxiliary bad or the main bad? Should I just replace main battery and do auxiliary delete? I have a TazerJL installed, does that need to be returned to stock before replacing batteries??

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[WranglerMan]

Replace both batteries if they are original, if you don't like ESS do the ESS delete and just replace the one main battery.

 

[BobW]

Just replaced both last November. Main is trivial, aux actually really easy via pulling off fender flare (much easier and simpler than sounds at first).

 

[Bandit59]

My 2018 JLUR 3.6 with 30k miles starts fine with ignition push button start. But when I use remote start it acts like dead battery either clicking or cranks slow for a second and stops. If I drive for awhile remote start works but after sitting overnight same issue. Batteries are original, Jeep was ordered from factory delivered May of 18.
So is my auxiliary bad or the main bad? Should I just replace main battery and do auxiliary delete? I have a TazerJL installed, does that need to be returned to stock before replacing batteries??

If your batteries r that old it’s time to replace both. You were blessed to get that long

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