popeyemth - It is my portable back-up battery charger. It is stored in my truck and I Have used it several times for charging batteries from there. My 2KW Generator is also stored in my truck. They both go where I go hehe...
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I also love having something to help out the neighbors in need... If I see a neighbor camper in need I will use the Generator and portable charger in lieu of hooking a dangerous and sometimes unknown battery jumper hookup. Only takes a good five minutes to get them charged back up then we can visit some sharing some good ole fresh made bean coffee I always have with me.
I have been known to run my own truck battery down yapping too much on my HAM RADIO setup.
Its all about having PLAN-Bs for me when I am camping off the power grid.
Roy Ken