Battery for Sennheiser RI 410 (IS 410) / RR 4200 (RS 4200 II) / RI 840 (Set 840 TV) / RI 840-S (140mAh) BA300 BA 300 (Electronics)
After about 15 hrs. Charging time of Sennheiser clip is about 9 hours used before he logs on to reload. The old original battery was now completely discharged after 2 hours. Very satisfied with the quality of this battery.
