The original NiMh battery pack that came with the Whites Spectra V3i has finally weakened enough that it needs to be fixed. I switched to Lithium Ion rechargeable batteries. Details in the video.
There is a company in Oregon, Centerville Electronics that has some still. They have a website. Selling at $13. I don’t see any reason that you couldn’t make this work with a few local off the shelf items. .