Sony BP-HP550-11 Battery Replacement - (Ni-MH, 2.4 Volt, 700 mAh) Ultra Hi-Capacity Battery - Walmart.com
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Amazon.com: Battery Compatible for Sony BP-HP550-11 Cordless Phone Battery Ni-MH, 2.4 Volt, 700 mAh - Ultra Hi-Capacity - Replacement for Sony MDR-RF810/840/850/860/925/970/4000 Cordless Phone Battery : Electronics