Necessary replacement ?!

Necessary replacement ?!

Sennheiser BA 300 Lithium-Ion battery for Sennheiser IS 410 / RS 4200 (accessory)
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Customer Review

Hard of hearing mother said to need a replacement battery. On closer inspection this is fragelich because after using the Sennheiser equipment always followed by a charging time! Custom to this replacement battery? Who knows!

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