Amazon.com: BATT-511 - Ni-CD, 3.6 Volt, 850 mAh, Ultra Hi-Capacity Battery - Replacement Battery for PANASONIC P-P511, TYPE 24 Cordless Phone Battery : Electronics
handbird 2x Phone Battery For P-P511 PP511 HHR-P402 GE 26400 86400 GE-TL26400
Amazon.com: Kastar Battery Replacement for Panasonic N4HKGMA00001 Cordless Phone Battery and Panasonic P-P511, HHR-P511, Type 24 Rechargeable Battery : Electronics
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Panasonic P-P511 Replacement Battery
HHR-P511 / HHR-P402 Battery, Type 24 &Type 30 NI-MH Rechargeable Cordless Telephone Battery 3.6V 1800mAh, Replacement for Panasonic HHR-P511, HHR-P402, P-P511 (Detail Models in the Description) - Newegg.com
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Panasonic P-P511 Battery Upgrade
Kastar Ni-MH 3.6V 1800mAh Battery for Panasonic TYPE 30 P-P511 PP511 Cordless | eBay
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P-P511: 3.6v 1500mAh Ni-MH Battery for Panasonic Cordless — Batteries America