So today I was out and I forget my iPad so all I had was my iPhone 4 and my Niki PowerCase For iPhone 4S / 4 usually I carry other items to charge like a cable and extra battery packs so I was bit worried if I would be low on juice for both the phone and the battery pack but I was wrong it I made it back home with half battery on both devices. The iPhone 4 PowerCase from Niki has a built-in 1700mAh battery, which effectively doubles the battery life of your device. Never again be caught running out of power in the middle of the day. The design is quite cool very much different from my powercase I have from proporta which is a sider power case this case is does allow a perfect fit for all the ports, speakers, microphone, buttons and camera. the place where your 30 pin connector would be on a regular case is a handy battery level checker, which gives you an instant idea of how much power you have left. The case charges over micro USB, so is compatible with a huge range of chargers. Not only is this charging case useful, but it’s designed to add as little bulk to the phone as possible, and look stylish to boot. It has a tough exterior which is designed to add a layer of protection to you phone. This helps to protect the device from knocks and scratches. Over all I really like the Niki Powercase so if you are looking for a powercase that wont break your budget I would check out Mobile fun for your iPhone