Meaning of the wall-plug icon while in charger

Hello !
When I charge my iPhone it first has the lightning bolt while charging, then switches to the wall plug icon when its charged. When I leave it this way, the battery depletes slowly just as my macbook does until it reaches about 93% then the lightning bolt is displayed again indicating its again charging to 100%.
Ok so here is my question: When its finished charging and the wallplug icon is shown, does the iPhone still get some "small" charging current to slow down battery depletion or nothing at all? Or in other words: Does it make a difference when I take the phone off the charger as soon as the wall plug is shown compared to leaving it in the dock?
Kind regards,
Sascha

OK, please let me rephrase what you said (this helps me to check if I understood ):
The lightning bolt changes to the wall plug when charging of the battery is complete. At this time, the battery is internally disconnected from the phone and the charger.
From this point on the operation of the phone is entirely maintained by the charger as the battery is not "connected".
Even while the battery is not connected it will slowly deplete due to internal leakages and other chemical processes.
As soon as these internal leakages drop the battery level under a certain percentage, the phone connects the charger again to the battery and charges it back to 100%, then disconnects the charger again.
When the charger is disconnected from the phone, the phone connects itself again to the battery to power the phones normal operation by the battery.
Right?
Correct me if I am wrong, but this means, that it is totally harmless for the battery if the phone is left in the charger, as the battery is only charged when the internal processes dropped the charge level under about 95% which does not occur often, and in the meantime the phone is powered by the charger.
By the way, when left in the charger my 4S needs about 2 days to drop low enough to be recharged, thats about 93%.

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