Everyone who owns a smartphone knows that if they have one shortcoming in common, it’s battery life or, actually, the lack thereof. You’re lucky to get a full day’s use out of it with even moderate useage.
I just found a very handy device at Amazon that provides nearly the perfect solution for this problem It is the Yubi Power YP520A external battery charger, which is actually a battery itself. It stores up to 5600 mAh of power and has a short cable with adapters for mini and micro USB and Apple. Just plug it into your phone and it will recharge it. It’s compact enough to slip into your pocket and frees you from having to tether yourself to a wall outlet, if you can even find one. I gave mine a quick test after it was delivered the other day, after first fully charging it up off the USB port of my laptop, and found that it took my phone from about 45% to 75% power in about two hours. I haven’t tested it to full charge yet and will report back if I get around to it any time soon. The best thing was that I could still carry my phone around with me while it was charging. I carry it in a case on my belt (Yes, I know, I’m a nerd). I just put the phone in the case USB port down (the case is partly open at the bottom), plugged the ~9” cable from the charger in and dropped it into my pocket.
There is also an 8400 mAh model, the YP840A that can recharge two devices at once: