Sennheiser PXC 550-II Instruction Manual page 19

The Smart Control app also displays the battery charge status.
On the headphones, you can check the battery charge status via the
voice prompts (not possible when listening to music or on a call):
▷
Tap the touch pad and hold for approx. 4 sec.
You hear beep sounds and a voice prompt informing you of the
remaining battery life. Depending on the battery life of the head-
phones, the LEDs flash or light up.
Voice prompt
"Recharge headset"
"More than xx % battery
left"
Right R
LED
1 red
1 white
2 white
3 white
4 white
5 white
Using the headphones
Meaning
The rechargeable battery is empty.
Recharge the rechargeable battery (>
12).
In addition, the LED display flashes
red.
The remaining battery charge is
displayed as a percentage.
"Recharge
headset"
Hold
4s
"More than
xx % battery
Meaning
Rechargeable battery is almost empty
(less than 2% charged)
Battery is approx. 2-20% charged
Battery is approx. 20-40% charged
Battery is approx. 40-60% charged
Battery is approx. 60-80% charged
Battery is more than 80% charged
left"
PXC 550-II | 19