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Long time ago Ezekeel, a xda-developers user, published a kernel mod for the Nexus S that let you choose the max percentage that the battery could reach while charging. It was called BLX aka Battery Life eXtender. I always set it to 80%. I've always been intrigued by extending the life of li-ion cells and that's the only work that goes into that direction AFAIK. I believe it was 2011. There hasn't been anything like that ever since.

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There's AccA (and the command-line ACC) which allow fairly sophisticated control over max voltage and charging rates, with easy profile switching (features depend on kernel/hardware, but works with a lot of stock ROMs). Root is required, unsurprisingly.

https://github.com/MatteCarra/AccA/releases/

>There hasn't been anything like that ever since.

https://github.com/sriharshaarangi/BatteryChargeLimit/

root required, obviously.

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