This may depend on who made the battery, its precise chemistry, the permeability & thickness of its separators, etc, etc.
I've been running the Lenovo R61i laptop I'm writing this in that way (it gets run on its battery roughly every year or two) ever since I bought it about 10 years ago. I've just pulled the plug and it is currently reporting a drop in capacity of around a minute for each minute run. Original capacity was about 2.5 hours running and is now down to a bit over an hour.