[Help] PodPoi 1.2 batteries died.

I have some pod poi 1.2 (ancient I know) they have a lot of sentimental value, does anyone know where I can find the right batteries to replace in them? They’re like shorty 18650’s. I’m fairly proficient with soldering, so that’s not an issue. Flowtoys replaced them one time but no longer carry or offer the batteries for the 1.2’s, and wouldnt tell me the battery that’s needed. Any help is greatly appreciated!!!!