Seidio invests in extensive research to find the best and most powerful battery components on the market. We carefully select top quality Japanese cells for our batteries to ensure the highest level of safety, quality, and performance. Our research, knowledge, and expertise give us the ability to create batteries that provide maximum capacity in their comparable space. This Innocell Extended Life Battery is designed for the customer who needs extra life, but doesn't want to add any thickness to their device. This model fits in your device's existing battery space and doesn't require a replacement door, which makes it a perfect replacement for your original battery.