Basically don't trickle charge a lithium battery and after a steady short charge on a lithium, disconnect the charger.
This is really dependent on the battery and charge equipment.
HD does not specify on their website if the "LiFe" battery is LiFePO4 chemistry. Can only assume that it is.
https://www.harley-davidson.com/us/en/shop/lithium-life-8ah-battery/p/66000175My experience is with high quality commercially available LiFePO4 100Ah 12 volt batteries, Specifically Battle Born. There are several "builders" now supplying batteries to the RV and alternative energy sector (and many of those builders all started out together).
My batteries are pricey and come with a 10 year warranty. The manufacturers states it is ok to be left with a maintenance charger connected (with the proper profile).
Under the proper charge profile the battereis can be left on "float" charge indefinitely. But there is no need to do so if the battereis are not in a an active environment, eg connected to various vehicle parasitic loads.
LiFePO4's can be left on a float charge of 13.6 volts, which is why conventional SLA chargers should not be used.
If disconnected from the vehicle LiFePO4's can be left 6-12 months with no chargers connected and best practice it to store the battereis at 50-70% state of charge. Apparently continued 100% SOC storage can degrade the batteries over time.
Even if left in a circuit which has a draw, the built ion BMS, battery management system should "turn off" the battery when the voltage drops to a point where any more discharge could harm the battery.
I have done this once so far with our RV. I leave everything on when not in use, any 12 volt systems and a 3000 watt inverter for the fridge, outlets etc and depend on solar to keep the battereis up. I had once fault with the solar controller and the batteries where not being charged.
The battery is not really dead, just turned off. I simple jump start from another 12 volt source will turn them back on and be ready for use.