TechniSat DIGITRADIO 2 Instruction Manual page 100

The rechargeable battery for the DIGITRADIO can also be bought separately in
stores.
> Place the battery compartment lid onto the battery compartment (1) and slide it
in the opposite direction to the arrow until it clicks into place (2).
The battery is charged as soon as the device is connected to the mains. The
charge status is shown on the display with a battery symbol.
Replace a rechargeable battery that is weak in good time or recharge it.
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