I've relocated to an area that sometimes has power outages for a day or 2. This has me concerned about my Gnex. 1. Is there a battery (AAA, 9-volt, lantern battery, you-name-it) powered charger I can get for the Gnex? 2. Is there another way to charge it during a power outage? 3. Should I get a regular spare battery? The 2100 extended spare battery? Or Seidio's 3300 battery? 4. Whichever batter I get, is there a charger for it that I can use to keep the spare charged?