Thank you. That did it. I picked up a small screwdriver from my well equipped instrument collection, inserted it in the little hole, pressed gently and - sesame - the flip in the bottom opened away. The set of two lithium batteries emerged, D2cm, 3V each. I thought that the whole cover would open like in mobile phones. Fortunately I didn't force that. So, now I just have get the batteries and the problem is fixed. Thank you for your valuable consulting.
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