HTC HD2 Extended Battery w/ Battery Door features 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. **Battery needs 3x full charging cycles to be effective. Type: Battery Compatible Phone Manufacturer: HTC HTC: HD2