What is the best portable battery charger for the Iphone 4?

I always run out of battery and could use a good recommedation, what do you guys use?

My friend has this thing that you charge and then bring it on the go! Sorry I don't know what it's called!

There are many different brands and some which have no brand! But there are some well known brands such as Yoobao and Mophie. However, because these have brands and they are trustworthy, they are more expensive compared to other portable battery chargers. Some people make fake versions of these and claim that they sell it $10 cheaper compared to the retail price so before buying you should compare it to online pictures to see if it's the fake version. You should also not buy it if the price is too good to be true because it's most probably a scam.

  • Which company is good for iPhone portable charger? I'm in India and want to buy portable charger (Power Bank) for my iPhone 3GS and iPhone 4. There are many available in the ebay. In but I'm not sure about the quality so if anyone can suggest a good and reliable manufacturer's name.
  • Where can I get a portable iPhone charger? I'm going to a music festival and will be taking my iPhone 4(I know shouldnt take phones ect but I'm taking mine) and I will need to keep it charged, I'm going for 5 days, I need some sort of portable charger that will help keep it alive for those days, A battery powered one would be helpful(AA, AAA ECT) I will only have my phone on at night and will only be texting, any help? I want to keep it about £25 or under
  • What portable iphone charger should I get? So I'm looking for a portable iphone 4 charger that will work for 5 days. I'm willing to pay a good amount and it doesn't have to be compact or pretty. All I want is for one to keep my mobile charged for 5 days please
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