Actually recommendations are keep it topped as much as possible. The closer to 100% you are charging, the more cycles you can squeeze out. But there's a point when it becomes impractical though.
In every case I've looked into, holding a Li-ion battery at 100% leads to drastically shorter life. That's why they are shipped only partially charged, because they could be sitting on a shelf for weeks or months before being used.
If I remember correctly that's only when storing them. But if they're being used its supposedly not a problem. Although it does contribute to wear and tear, there's the benefit of increased cycles available. We'll just have to balance it.
That's why I distinguished in my first comment between looking ten storage and charging to use. Even then, it can cause problems. I once killed a battery in about 6 months by leaving it plugged in almost constantly wanting to have power just in case I suddenly wasn't around an outlet. Keep in mind, I was actively using the phone a lot, just while plugged in. That was before I started researching charge and usage habits.
Ah. I think there's the difference between leaving it plugged and just a low range drain cycle. In leaving it plugged there's still a current in the wire causing heat. And we don't know how fast it can burn through the overcharge protection circuits.
It's not overcharging, which would lead to the battery bursting. It's an internal breakdown that reduces the ability to store and transfer energy. Once charged, the phone shuts off power to the battery, in a manner of speaking, leaving it there while using the charger to function. Similar to how you can disconnect the battery from the car once started and it'll run just with the alternator alone.
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