Limefuel was founeded about 2 years ago by Paul Lin. He was trekking across the country after trying to get out of New York during Hurricane Sandy. Along with a few friends they rented a car and were stuck sharing 1 USB port to keep their devices juiced up. Lin wanted a better way to charge devices on the go. He created a battery company.
Limefuel focuses on portable battery packs and extended batteries for cell phones, tablets, GoPros and even drones. I reviewed (and drove over) their rugged battery pack a few months ago. It proved to be a pretty tough battery pack for the adventure seeker who wants to keep their devices charged up.
Their latest Kickstarter project is designed as an inexpensive way to expand the amount of time you get out of your GoPro. Lin says their extended battery packs for the GoPro Hero, Hero 3 and Hero 4 will provide 8-10 hours of video recording. Most GoPro users will tell you an hour or 2 is usually the most you can get before it's time for a recharge. I tested it out in the Fox31 studio and shot a 4 hour timelapse with plenty of battery life to spare.
You can find Limefuel's products on Amazon. The new GoPro batteries will be available in April but you can order them now on their Kickstarter page.