For Iphone External Battery Pack and Charger Packaging&delivery Packaging:original factory packaging/customized Delivery:5-15 days depending on quantity aftere sample confirmed Detailed description 1 ultral thin battery case for iphone 3g,3gs.used as a backup battery charger and protective case. twice iphone battery life. 2 Cell capacity:1300mAh/3.7V 3Cell type:Polymer Lithium-ion battery(ATL) 4 Output voltage:5V 5Output current:700mA 6Cycle life:600 times Feature: 1.Themobile battery chargercan provides you twice the battery life of the iPhone 3G/3Gs and its considerate human engineering design on the hard-shell case offers you full protection of iPhone 3G/3Gs 2. Designed by China top class University, Tsinghua University. Ultra thin in designing (the thinnest protective battery) and excellent in workmanship, which can perfect match your Iphone and your iPhone can be more perfect with the our V1300i 3. Can solve the problem that other products may bring some frozen or unsteady to iPhopne 3G/3Gs due to the electromagnetic interference while answering the call when charging. V1300i is the only protective battery that can remove the interference from Iphone and even V1300i wont stop charging for Iphone while answering the call and the calling quality always be smooth and sound. 4. Adopt ATL Polymer Li-ion battery to ensure the best quality and security 5. Charing and transmission can work synchronously..V1300i never need to take off from your iPhone and you can use the same cable to achieve both charging and date transmission. 6. Various protection like short circus protection, over charging protection, over discharge protection and temperature protection can ensure your iPhone absolutely safe and sound iPhone 3GS Standby time:Up to 270 hours Talk Time: Up to 4.5 hours on 3Gs Internet Use: Up to 4.5 hours on 3Gs, Up to 8 hours on Wi-Fi Audio Playback:: Up to 27 hours Video Playback:Up to 9 hours iPhone 3G Standby time:Up to 271 hours Talk Time: Up to 4.5 hours on 3G Internet Use: Up to 4.5 hours on 3G, Up to 5.4 hours on Wi-Fi Audio Playback: Up to 20hours Video Playback:Up to 6 hours Specifications: Cell capacity:1300mAh/3.7V Cell type:Polymer Lithium-ion battery(ATL) Output voltage:5V Output current:700mA Cycle life:600 times