I'm hedging my bets - my Windows HP Laptop remains connected all the time - except when I'm at home when there's a power failure, a frequent occurrence in rural New Zealand, and I don't want to risk a power surge despite using a so-called "protected" power board, never say never - so the battery is permanently trickle charged. Very occasionally I give it a birthday present and let it run down, but very rarely.
My iPad runs from Hero to Zero all the time, but when I put it on charge again at 2% remaining I also attach it to a timer for 4 hours, which from experience takes it just up to 100% again - then it disconnects.
I think it's all like diets, just do, or eat, that which you are comfortable with, Murphy will get you whatever you do. Makes no matter how hard you try. At my age I'll probable die of Ice Cream ( or chocolate ) before my battery runs out.
Not even going to discuss what I do with my Nokia, ignorant ( i.e. not Smart ) mobile phone.