Seidio extended battery and door is a cell phone replacement battery that will significantly lengthen your Blackberry's battery life. Even with heavy data use and extended talk time, the Seidio cell phone battery provides 85% more capacity than a standard cell battery. This Seidio high quality Japanese cell phone battery has a 2600 mAh capacity. It includes a black door with soft-touch texture to improve grip. It extends the depth of your Blackberry by only 3-4 mm.