Fuel your adventures with this DigiPower Re-Fuel RF-6H34 Lithium-Polymer Battery, featuring up to 6 hours of battery life per charge. The water- and dust-resistant design also includes a micro USB port and USB cable so you can plug into your camera.
Not much else to say. Only tested this battery for a week so far while on vacation capturing video - underwater, zip lining, etc - as well as 45 minutes of time lapse sunset photos (recommend 1-shot every 5 seconds if slow moving clouds).
Per the sunset shoot above, I suspect you won't achieve as much additional battery time as advertised BUT this pack is a huge step up from the standard size battery packs requiring fewer pack change overs if any.