Samsung AB923446BA/AB923446BAB/AB923446BABSTD Extended Lithium Ion Battery - Original OEM - Non-Retail Packaging - Black This extended battery by Samsung is a 3.7 volt lithium ion battery that will usher in about 1550 mAh of power to your compatible device. When using this battery you will need an additional battery door that is made to hold this slightly larger battery. Samsung uses the latest in lithium ion technology to provide your compatible Samsung phones with the best possible performance available. OEM Samsung Part Numbers: AB923446BA/AB923446BAB/AB923446BABSTD