Samsung Epic 4G Extended Battery w/ Battery Door More talk time and standby time (compaRed to standard battery) 100% compatible* lithium-ion battery Extended battery door included Great for use as replacement or back-up Memory-effect free - does not lose maximum charge capacity from repeated charging Color: Black Package includes Extended battery Extended battery door Important Disclosures *Extended batteries extend out about 1/4" from the phone and may cause compatibility issues with standard accessories. **Actual mAh rating may fluctuate +/- 100mAh without notice. Type: Battery Compatible Phone Manufacturer: Samsung