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Amazon.com: Empire Wireless Headset Battery, Works with Sennheiser RS-40 Wireless Headset, (Ni-MH, 2.4V, 80 mAh) Ultra Hi-Capacity Battery : Electronics
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Amazon.com: HQRP Battery 2-Pack Compatible with Sennheiser RR820 RR820S RR2500 HDR65 HDR80 RS40 RS400 RS45 RS6 HDR4 HDR60 HDR45 Free Sound HDR-6 Headphones Receiver : Electronics
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Sennheiser RS-40 Battery - Replacement for Sennheiser BA151 Headset Battery (60mAh, 2.4V, NI-MH) - Walmart.com
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Amazon.com: HQRP Battery Compatible with Sennheiser RS40 / RS 40, RS400 / RS 400, RS45 / RS 45, RS6 / RS 6, HDR4 / HDR 4, HDR60 / HDR 60, HDR45 / HDR 45, Free Sound HDR-6 Headphones/Receiver : Electronics
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