Their description:
Product Description
Extend the battery life of your Apple iPhone 3G & 3G S with the Energizer AP1000, a rechargeable lithium polymer battery in the form of a slim light weight protective case with non slip grips…. More >>
Go & get it here - i can recommend it:
Energizer iPower Protective Case with Built-In Rechargeable Li-Ion Battery for iPhone 3G, 3G S
Hello! I bought one of these for my wife (I missed the Lightening Deal!) and it works just as it claims. She loves the extended battery life. The problem is, she has not been able to find a carrying case or clip-on holster (for her purse)that accommodates the extra length. If you have a product that allows the extra size to fit, please let me know by “commenting” on my review. Thanks for your ideas!
I bought this when it was a Lightning Deal, using it for the first time today. The charger works just as it’s supposed to, using the battery from the charger while the phone battery stays full. I fully charged this overnight before using. I anticipate a much longer batter life on my 3g s now that I have this to use.