Sennheiser ACCENTUM Over-Ear Wireless Headphones (Black) - Manual (Page 12)

Using the headphones
12 | ACCENTUM
Using the headphones
Information on the rechargeable battery
and the charging process
The headphones have a built-in rechargeable battery. A complete
charging cycle takes approx. 3 hours. The charging time can vary
depending on the power source used and the ambient temperature.
Before using the headphones for the first time, charge the recharge-
able battery for a complete charging cycle without interruption.
When the headphones are being charged, the LED display lights up
(>8). Once the headphones are 100% charged, the LED lights up
green for 5 minutes and then goes off. When the battery charge
drops to a low level, the voice prompt “Recharge headset” asks you
to recharge the headphones. If the headphones are not charged, the
voice prompt will be repeated every 10 minutes until the headphones
switch off.
Sonova Consumer Hearing recommends using the supplied USB
cable and a compatible standard USB power supply for charging the
headphones.
While the headphones are being charged, you can still listen to
music or make phone calls. In this case, however, the charging time
may be longer.
At the end of its operational lifetime, this product with its built-in
rechargeable battery must be disposed of separately from normal
household waste. You can find more information here: > 39.