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Replacement NiMH BA 150 BA 151 BA151 Battery for Sennheiser Headphones
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Amazon.com: MPF Products BA 150, BA 151, BA 152 Rechargeable Battery Replacement Compatible with Sennheiser IR and RF Wireless Headsets (Compatible Models Listed in Description Below) : Electronics
Sennheiser BA 151 Rechargeable Nickel-Metal Hydride (NiMh) (004146)