Amazon.com: Replacement for SENNHEISER is 300 is 150 is 380 Set 20 SET-20 BA151 A200 Audioport A200 Set HDI 302 HDI 380 HDI302 HDI490 R150 RA-85 RI 150 RI 250 Battery : Health & Household
Battery suitable for Sennheiser IS 150 - 60 mAh battery - BatteryUpgrade