Replacement Battery for Sennheiser Wireless Headphones
The Sennheiser BA 151 Accupack is a rechargeable battery for Sennheiser R-Series and RS-Series cordless headphones. The BA 151 fits into the headphones for normal headphone use and recharges via connection to the RS-Series or R-Series headphone transmitter.
The BA 151 Accupack has an initial charging time of 24 hours. After that, the normal charging time is 14 hours. A fully charged Accupack has an operating time of approximately four hours.