Joe Bob,
How about a "power bank" type device? http://www.amazon.com/s/ref=sr_pg_2?rh=n%3A2335752011%2Ck%3Apower+bank&page=2&keywords=power+bank&ie=UTF8&qid=1451008653&spIA=B00UC8V2SO,B00U9YCID4,B00WHJZGWY
I have one that I haven't used or will use. If you think it would work, PM me your address and I'll ship it to you.
Rutager
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Rutager West
1977 911S Targa Chocolate Brown
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