You can click on my link above
www.dgbint.com
Send me a message that way.
The original i167 supported only NiMH batteries ( thin ones ).
Most machines received a software update, and could support either NiMH ( thin ) or Li-ion ( thicker ) batteries ).
Most dealers who updated software placed a round flyguy sticker on the chassis somewhere.
Not sure of the status of your machine.
NiMH batteries were discontinued about 10 years ago.
There will not be any new ones available.
Undamaged ones can be re-celled.
Sounds doubtful in your case.
https://www.mtobattery.com should be able to give you advice.
If your software has been updated you may use Li-ion batteries.
You just might find some new ones, or freshly re-celled ones.
Again MTO can probably guide you.
Good luck
Michael