I'm going ice fishing for a couple days and will be without electricity. I once purchased some charging device at Best Buy for a road trip and it only charged Vapor Titan batteries for 4 hours before going kaput. I'm guessing I'll be chain vaping in the fish house, and would love to find a dual USB port rechargeable charger (not disposable) that I can trust. Not sure what the temps will be, but probably will sandbag battery charge to begin with. Anyone have any recommendations on a recharging station that I can charge up before the trip and rely upon as I rotate Vapor Titan batteries?