Remington Shavers Parts
The R9190 has two AA NiCad batteries soldered together with some wiring. They are relatively easy to replace once you figure out how to get the case apart.
I continue to get a lot of hits on this web page so I can only imagine that many people have encountered the same problem, i.e., a razor that is still working, but with batteries that have gone flat. A very nice gentleman sent me the images below complete with annotations to show how he repaired his Remington Model 8100 razor. He replaced the solder tail AA batteries with holders for AAA batteries. Even though AAA batteries are much smaller, and usually have half the capacity of AA batteries.