Question about Teufel Rockster Air

- Unscrew the cover on the back.
- Remove the battery and disconnect it from the cables.
- If available, measure the battery voltage with a voltmeter.
- If the battery is gone, connect the device to the mains plug, then you will have 10 seconds to switch on the device using the big round button.
- If this works and the battery can no longer be charged, it is probably deeply discharged or a defective cell. Replace battery: Teufel Rockster Air battery
If that doesn't work, maybe the battery was attached the wrong way round? Then there is a microfuse hidden in the red battery connection cable. This may be defective.
Good luck

Oh yes, I'm a pro at this by now. If you unscrew the flap on the back, the battery is underneath. If you disconnect the battery, i.e. remove the connection contacts, then connect the unit with the mains cable, you will have 10 seconds to switch the unit on using the big round button. This would prove that the battery is bad, but the box is OK.
If you accidentally connect the battery the wrong way round, there is another fuse in the red battery connection cable, which is probably defective.
I had to replace the battery because mine was deeply discharged, plus this fine-wire fuse because I was too stupid to connect the new battery the right way round.
Here is the link for the new battery.
Teufel Rockster Air battery
Good luck.

Servus my bocks can be switched on once and when i switch it off it won't switch on again do you know who the problem is because teufel writes they don't have time

Hello Fabian,
Have you already solved the problem?