Do you mean a wireless charger? If so, scroll down and check out the other couple of threads on the subject.
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Oh, I see... Yes, I was thinking about getting one of those as well.No... I'm talking about the little battery packs that you can plug into your phone on the go to charge it when not near an outlet
I got an Anker Astro 3 from Amazon which has 10000mAh which might be more than you need. I've charged my Galaxy Nexus twice with it when it had about 20% left and it still showed 2 lights on the Anker (power left). They have 3 different sizes (8000 and 5600mAh). I bought it because of the good reviews on it and thought I might as well get the biggest one. No regrets!
Recently I found a very nice external battery at amazon.com,this design is rare to be seen in the market,it looks like a Robot,so the seller give him a very interesting name--xRobot.a wonderful battery pack with built in cables for your Apple products (for the new Apple connector you have to use your own cables) , Android products using micro USB ports and it still has a built in USB female port for all of your other devices. There is even a cable for charging the battery pack built in. It can charge your Apple devices with up to 2.1 Amps and really provide a boost to your tablet or smart phone.
Amazon.com: Customer Reviews: RAVPower? xRobot RP-PB05 Power Bank / External Battery / Juice Pack -6000mAh Capacity / 2.1A Max Output for APPLE: The New iPad, iPad Mini, iPad 2, iPhone 5 4S 4G, iPod Touch, Nano; Smasung: Galaxy Note 2 N7100, Galaxy N
Depends on what you want--something slim enough to stick in your bag, just enough to give you 60% extra battery life? Or a heavy-duty 10000mAh to last you a camping trip?
Being the sort to travel as light as possible, I have the Anker 2600mAh in my bag at all times ($20 on amzn). It's a little shorter than two lipstick tubes, and not much thicker. Probably not the fastest charge, but it's always good to have that extra insurance whenever you need it. If size isn't an issue, you might as well go all-out and get the 10000mAh one ($40 on amzn). Seems roughly the same size as the DNA itself, so although bigger it's by no means huge.