I’ve been using this Energizer Energi To Go XPal XP2000 for more than a year now I think. Yea, yea slowpoke, I know! I’m actually quite surprised that a lot of people are not aware of this thing. There are actually a couple of different brands for power packs/external battery pack but I choose Energizer because it is a reputable brand. You don’t want to buy a cheap power pack only to plug it into your expensive smartphone and spoil it! I initially bought this for my iPhone 3Gs and HTC Desire but I’m always lending out to friends to charge their blackberries and Nokias. The Charger also works for…