iPhone 6/6s Power Case C1001 Power Case has a built-in 2400mAh Li-Poly battery that extends the usage time of your iPhone. Now you can use your iPhone for calls, pictures, video, games, and business apps with the assurance of continuous, stable power. With its slim profile yet sturdy design, the C1001 iPhone 6/6s Power Case gives extra protection and extra power on-the-go.