The Blueshift Helium Portable Speakers ($350-$500) are powered by super capacitors that charge in under five minutes and play for over six hours at full volume. These super capacitors are much better than standard batteries because they can be recharged over 500,000 times and repaired if they fail.
The guys over at blueshift are combining classic styling with modern electronics to create a bluetooth speaker that works anywhere and sounds awesome. The Helium’s feature Fostex FE 126 4″ full-range drivers, and hand built sustainable bamboo cabinets. They are designed to be repairable and upgradable and meant to last a life time. Options include single and dual speaker models.