HumanTechnik swing ir Manuel De Service page 37

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Charge battery
Once the battery is fully charged, it can be used for up to 6 hours. The red
LED 4/13 starts flashing once the battery is almost empty. The battery should
now be charged or exchanged. The operating time is dependent from the set
volume and from what you hear.
18
After use, put the receiver onto the charging bowl of the receiver without
applying pressure.
Ensure that the receiver is placed correctly. If the receiver is charged, the red
LED 18 at the left side of the receiver is illuminated. The LED 18 is illuminated
green as soon as the battery in the receiver is charged.
20
An additional battery can be charged in the sender. Additional batteries are
available at your specialty retailer.
The additional battery can be plugged in into the side charging bay 19.
Please ensure that the milled side points upward and that insert it without
applying too much force. If the LED 20 is illuminated red, then this battery is
charging, if the LED 20 is green then it is ready for use.
We recommend to exchange the battery in the receiver and the spare battery
in the sender weekly. This means that the batteries are used regularly and
that they achieve a maximum service life.
All batteries loose their capacity over time. This is characterized by a shorter
usage time.
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