Amazon.com: Empire Replacement Battery For SONY BP-T38 3.6V 900mAh-Connector : Electronics
Amazon.com: Replacement for Sony BP-HP550-11 Battery - Compatible with Sony BP-HP550-11 Headphone Battery - Compatible with Sony MDR-RF860 MDR-RF4000 MDR-RF970 MDR-RF970RK MDR-RF925 (700mAh 2.4V NI-MH) : Electronics
Amazon.com: Synergy Digital Battery, Compatible for Sony BP-HP550-11 Battery Replacement - (Ni-MH, 2.4 Volt, 700 mAh) Ultra Hi-Capacity Battery : Electronics