How To: Take an indefinitely long time-lapse with the Garmin Virb

I wanted to do a long time-lapse of our river but the battery only goes for 3 hours at best. One option is to get extra batteries and swap them out when one dies but that means i have to be there when it dies. My solution was to use a solar powered battery box that I had, the Xantrex PowerPackSolar unit that has a 5 watt solar panel attached and a 10Ah battery internally. It has a USB charger as well as 120 volt plugs, lighter socket and LED lights. Its useful for many things but one thing here was that I