That would be a bad idea, for any rechargeable light.
A "good" charger would terminate completely once fully charged, so there would be no benefit to leaving it plugged in (i.e., it does not start re-charging on its own). A "bad" charger would drop to a low "trickle-charge" - which, depending on its current charge level would slowly (or quickly) cook your batteries. Same goes for chargers and individual batteries - they should always be pulled from the charging unit once charging is terminated.
In any case, there's no need to worry about this with Li-ions - they have remarkably low self-discharge rates, and will remain stable for years/decades.
The one wrinkle in this specific case is the standby current draw of the electronic switch on the SR-series lights. But it is so low (i.e., I measured it around 50uA on my sample) that it would take years/decades to drain the battery pack anyway. If you are worried about it, you could always break this current by storing the light with the head locked out. Given the spring, that would required roughly a full turn of the head away from the handle (basically, just keep turning until the light will no longer activate on a button press). That way your light is fully locked out, and any self-discharge would be so minimal as to be completely negligible.
Oh, and :welcome:
Will be my most powerful flashlight..
