Myself I am a fan of the NiMH rechargeables in AA and AAA format. My dental hygienist wanted me to get an electric toothbrush, I found the bottom-of-the-line model that takes AA batteries for about $15 less than a model with an integrated battery which is totally easy to use with NiMH batteries.
that I took out of mothballs. These had proprietary battery packs that can be replaced with AA's or AAA's, I found the old battery packs had gone bad but breathed new life in them with NiMH batteries.
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Myself I am a fan of the NiMH rechargeables in AA and AAA format. My dental hygienist wanted me to get an electric toothbrush, I found the bottom-of-the-line model that takes AA batteries for about $15 less than a model with an integrated battery which is totally easy to use with NiMH batteries.
I also had some old FRS radios
https://en.wikipedia.org/wiki/Family_Radio_Service
that I took out of mothballs. These had proprietary battery packs that can be replaced with AA's or AAA's, I found the old battery packs had gone bad but breathed new life in them with NiMH batteries.