2350mAh Rechargeable External Battery Pack for iPhone 4 - White

Pros: > This is a great little battery pack/iPhone case. It gives my iPhone 4S double the battery life it normally would have.
> Slim design, lightweight. It doesn't add much weight or an excessive amount of extra "bulk"

Cons: > The build quality isn't outstanding. It's not bad by any means but not amazing. For the price however you can't go wrong.
> Doesn't give the phone a lot of protection.

Other: For the price this battery pack is a great deal. A great option if you're going on vacation and need that extra battery boost. The battery pack isn't the best for protecting the phone, it IS however is very small and compact and fairly "stylish".

Pros: High capacity - gives 98% worth of charge in the 0-80% range for your iPhone. Estimated at least 1800mAh in the case Battery within manufactured not long ago, in Feb. I received my case in April. Tested on iPhone 4S Easily modified to charge both case and iPhone at the same time, draws 1.5A from USB port.

Cons: Charges iphone at ~500-600mA instead of the advertised 1A Case charges at ~500mA as well from USB port Without modifying, turn on the case when plugged into USB port to charge both phone and case, but charges both at 500mA total. Charging sequence: charge case battery -> case battery to voltage converter to 5V -> charge phone.

Other: If you can use a soldering iron and a flat headed screw driver, buy this and mod it. You won't regret it

Pros: Excellent gadget, very easy to use...recomendation for all...Excellent for people who is on the move all day, for travellers and young people.Very attractive design.

Cons: Nothing special...Maybe the weight is a little less, but you do not wear it all day, only when charging a battery.

Other: Superb gadget, but not used for phone protection. If you travel a lot or if you are a heavy user of you iPhone, this is a must have.