Aftermarket battery

Can you please tell me a compatible aftermarket battery for my altimeter. I can not find that exact size anywhere. I can find the equivalent voltage and mah but size is hard to get exact.

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I have exactly the same problem… My Dekuno starts now to switch off sometimes… ;-(
Ay idea already how to open the device?

Greetings

Same here. Need two new batteries for mine and my wifes dekunu

I found some compatible batteries, it’s not difficult, although they don’t have the same capacity or physical size.

The real problem is the connector between the battery and the circuit board. I have no idea which one is it.