Detailed Description High Quality, high capacity, light weight rechargeable DC 3.7V Li-Ion 1900mAh battery. Latest Lithium Ion battery technology gives the best performance possible compared to other battery technologies such as Nickel Metal Hydride (Ni-MH). Best replacement for the original Blackberry 7100r, 7100t series battery pack. No memory effect. Can be charged or discharged as needed without loss of capacity Overcharge protection, with built-in battery life microchip Compatible with: Blackberry 7100r, 7100t series. CE Certified 1 Year Manufacturer warranty Larger size compared with the original battery. A special design silver colored battery door is provided as the original battery door cannot be use with this battery. WARNING: This battery increase the size of your cell phone. If you are using a case for the cell phone, it will not fit in the case when the battery is apply on the cell phone. A silver colored door is provided to replace the original battery door cover.