To examine this question properly we have to go back in time, and bust some battery myths while we’re at it.
The first legend was born before lithium-ion batteries came to exist. Back then, the battery should have been discharged completely before it could be charged again, in order to sustain battery life. Lithium-ion batteries, however, work in charge cycles, so this issue has disappeared. The capacity does diminish slightly with each complete charge cycle, but that is due to natural wear.
So you don’t need to worry about discharging devices completely.
The next myth also originates from properties of older batteries. It’s rumoured that charging overnight kills the battery life in the long-term. It used to be possible to ruin a battery by ‘overcharging’, or leaving the device plugged in all the time. When you plugged in your phone for longer periods, older lithium-ion batteries could overheat. This heat can be blamed for the damage. Now we live in the age of ‘smart’, so the symbiosis of battery and software configuration has eliminated this problem as batteries will no longer receive more power than they require. We are also utilising technology called trickle charging which provides only the required amount of power to the phone at all times.
So don’t worry about your battery!
Anyways, batteries will deplete over time no matter what you do, so don’t obsess over it too much. If you keep your phone on a wireless charger in the office, or leave it on overnight, that would not ruin your battery life any more than if you would plug it in.