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
Sony AAA B2GN 900MAh Rechargeable Battery, Capacity: 900, Voltage: 1.2
Amazon.com: Sony SPP-S9226 Cordless Phone Battery Ni-CD, 3.6 Volt, 900 mAh - Ultra Hi-Capacity - Replacement for Sony BP-T50 Rechargeable Battery : Electronics