2 Pack Replacement for Sennheiser RS 4200 Battery Compatible with Sennheiser BA300 Set 830-TV RI 830 Set 830 S RI 830 S is 410 RI 410 RR 4200 Headphone Battery (150mAh 3.7V Lithium Polymer);

Please note: This is an UpStart Battery brand replacement part, not an OEM product. This product is not affiliated with any OEM brands and is not covered under any warranties offered by the original manufacturers. Any warranties for this product are offered solely by Upstart Battery. All mentions of brand names or model descriptions are made strictly to illustrate compatibility. All brand names and logos are registered trademarks of their respective owners.