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There is no "trickle" charge on Lithium. Even on NiMH it's better to cycle. Only Lead Acid and NiCd would typically have a trickle charge.
The charging system will stop / start cycle according to cell condition. As it ages, it's lying if it really means 100%, what it means is "charged as much as is safe".
Long term storage if the cell is disconnected or there is a real "off" is best cool, never freezing and between 50% and 90%, often 2/3rds (67%) is chosen.
The Kobo does seem to have a nearly real off. The Kindles don't, so they can't be put in a drawer and forgotten, they maybe ought to be plugged in every 2 to 4 weeks, I'm not sure.
All models will behave strangely if the battery is too flat to operate but not actually dead. Unlike NiCd and Lead Acid, force charging (directly, any decent internal charger won't) totally dead Lithium cells is a fire risk.
So it's safe to leave fully charged gear that's properly designed, plugged in. Except a lot of the chargers are fire risks and generate RFI, even official ones.
There is no memory effect either, that's not even a thing on Lead Acid or NiMH, only on the NiCd.
Don't leave fast charging devices unattended or on a soft surface if they are the kind that ever warms while charging, i.e. some phones, tablets and power tools.
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