Forget Trickle Charging!!!
That is not a function of the smart LiPo batteries.
After you charge them ( with any charger) and if not used for a number of days they will go into an automatic discharge to approx 60%. After that, if not used for an extended period, they will go into a "hibernation" mode for that extended storage period
Again, this is an automatic function of the circuitry in the battery and requires no input from either you or the charger.
They do not need any kind of "maintainer/trickle charge" and keeping any constant charge will damage them.
That charger that RUFFSTUFF and I have does have an option to force the batteries into that "storage" mode and will discharge them to that state but I really don't see why you'd need that.
I normally don't leave the batteries on the charger after they are charged for more than an hour so I can't personally verify this but if left on the charger after being charged, they are supposed to act like they are not on it ....until re-connected... meaning they will start the discharge normally....Still not the best idea to keep any battery on a charger indefinitely!
Just do a google search for DJI battery maintenance and you will get plenty of results for reading on that subject.