Has anyone tried one of these? It says it's OEM and it fits in/with the existing case/door.
HTC OEM 1500 mAh Slim Extended Battery For Verizon - Verizon HTC DROID Eris - Fommy.com
HTC OEM 1500 mAh Slim Extended Battery For Verizon - Verizon HTC DROID Eris - Fommy.com