AccuBattery can be set so your phone starts chirping at you when it's hit the charge limit you want. it will still charge, but you get notice it's ready to be disconnected.Interesting. This may have been covered in the thread already, but how are you preventing charging over 85%?
If you plug in or use a wireless charger are you waking up to stop the charging at the right time? Maybe one of the apps mentioned in this thread does that for you. I'll admit I didn't read the whole thing again.