ELEOPTION(TM) Rechargable Cordless Phone Replacemnt Battery of AT&T/Lucent: 9340, 9341, 9345, 9350, 9351, 9353, 9355, 9356, 9357, 9365, 9370, 9371, E1126, E1128, E2116, E2126, E2717, E2727, E2728, E5908, E5909, E5945, HS8200, HS8201, HS8210 100% OEM Compatible - Complies with or Exceeds OEM Panasonic P-P511 Battery specs Guaranteed to operate with your Panasonic P-P511 cordless phone CE Safety Certification Warranted for 12 months Works with multiple models, listed below - Use CTRL+F to find your model