I successfully installed modern Duracell AA NiMH rechargeable batteries in my Apple Newton eMate 300 today, 9 February 2019. Another cool thing is that I can actually see washers under the screws for the hinges through the translucent plastic of the case. No need to disassemble the screen assembly to check it out now. Feeling thankful for that!
One project done, a few more to go...