I researched 10+ different iphone battery cases and this NewTrent IMP 130 is the best no doubt. All the other similar items on ebay have lower grade cells that compose the battery pack. Lower grade as in not having the actual amperage that they say they have in them and being a low quality impure lithium product that results in much lower performance and lifespan.

Also the circuitry that is built in this NewTrent IPhone battery case is much more superior. Which ensures proper charging and discharging.

If lithium batteries do not discharge and or charge correctly then you can end up with a serious fire. Just google lithium battery fire or lipo battery fire and you will see. HP just had to recall 70,000 lithium batteries due to fire risk.

This is these guys specialty. They have their own manufacturing and lab testing facility here in the states. They know batteries for sure.

This case beats the mophie (80.00 at best buy)because it does not interfere with data/call reception like the mophie has been reviewed to do and the NewTrent IPhone battery case has a better non slip surface on it so it won’t slip out of your hand. Their customer service is also A+. You will not regret your purchase.

Buy IMP130 at http://www.newtrent.com

IMP130 with Extended Rechargeable Battery Juice Case Air for IPHONE 3G and 3Gs only $41.95

Originally Posted at New Trent IPhone Battery Case