F21 BATTERIES ??????

Hi everyone
I would like to know if anyone knows what kind of battery goes
in the F21 Electronic (Electronic Nailon).
Total voltage provided by the 2 batteries.
Or where can I find replacement or equivalents?

thanks for your help

G

The "Nailon" uses a rechargeable NiCd battery D-0,02, that is 2.5V 20mAh. Try it with a Lithium battery 3V and a small coin to give contact.
Regards Detlev