I think the most important thing with lithium batteries, is not to leave them in such a state of discharge for a long period of time, that the voltage of the cells dips below a recoverable state.
A battery pack that is fully charged to 100% and left for long periods of time, may at worst, have less useable service life.
A battery pack that is left in a very low discharge state for a long period of time, can drop to an unrecoverable state. Think of the old phone or iPod that you drag out of the junk drawer after many years of unuse, and no matter what you do, it just won't switch on.
Dead battery vs shortened life battery, I know which one I'd prefer.