Motor mover + Li-ion battery = fail?

[Rahdo]

So our small Swift Excel 382 caravan came with an enduro em203 motor mover, which usually works, but sometimes it fails and flashes 4 blue lights on the receiver, which is an overvoltage warning. Apparently this is happening because I replaced the lead acid house battery with a 12V 100Ah LiFePO4 Battery which, when saturated, outputs more voltage and a traditional battery, and that makes the motor mover shut down.

What can I do to solve this, other than spending an hour purposely running down my battery to get it to outputting lower voltage whenever we need to move around, which is incredibly inconvenient as one might imagine!

 

[birdman101]

If the Battery is overcharged and you are using the charger as used on the previous battery have you changed any settings on the charger if it has them. Otherwise it may be your charger is not compatible with the Battery fitted

 

[Rahdo]

when i put the li-ion battery in, i also installed a victron controller since as i understand it the old wiring for lead acid batteries could treat the new battery poorly. so charging the battery is no problem, it's doing great. it's just the 20 year old motor mover assumes lower voltage than what this battery outputs because it's new and things were different back then (i guess lead acid batteries put out 12.7 or so voltage, while this battery happily puts out 13.8, and that's what trips up the motor mover).

so i need something that can reduce the voltage coming from the battery to the motor mover. i read about buck converters, but they are only for small amperage usage, and a motor mover is heavy amperage.