Steve did.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://inspirepilots.com/threads/tb48d-batterys-will-work-in-i1.15571/&ved=2ahUKEwiGwt-es5nsAhVOrZ4KHWxgB5gQFjAAegQIDBAB&usg=AOvVaw2HVAcTOJ-yGJampUGAofFN
There's a company in Europe that does it, too. Do a Google search for...