EBL 2 Pack Cordless Phone Rechargeable Batteries for Panasonic BBTY0663001 P-P501 P-P501A P-P501PA P-P504 P-P508 PP508A P-P510 P-P510A Model: P-P504 3.6V 800mAh Ni-cd Battery 30days money back and one year warranty Designed to meet or exceed performance of original battery Fit for many more models ,please read the description