Originally Posted by eldermike
Paralleling two batteries with totally different capacities is not a good idea.
Eldermike is correct. That jumpstart will not last long and as soon as you would have plugged it into your 12VDC accessory outlet the discharged batteries would have brought the jumpstart to a voltage that would not be of any use. Pulling the fuse from the main batteries will not help either.
The 12VDC accessory outlet is not wired for that type of drain, and it could heat the wire up and cause a fire.
What concerns me is that you are or would be discharging your TT batteries lower than the 50% level of 12VDC. That will shorten the life of your TT battery(s).
If you are thinking about or doing any dry-camping a 2nd battery is a must, no two ways about that.
Just my thoughts,
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