I keep mine on the charger just like I did my old AC Delco so it's really not a bother. You can get a specific charger for the lithium or you can get a Noco Genius 2 for $50 and charge lithium, flooded acid, gel, AMG and deep cycle.
Where you located? I highly recommend finding a local guru that can help you find out what you got and advise you on what to mod or not to mod. You can very quickly hurt your engine if you don't understand boost and detonation.
I went through that with mine years ago. I had to add extra washers on the ones that were too long. Maybe they have finally corrected that after all these years.
That and open the radiator cap and look in. Start the engine and then pull the cap. There is also a combustion gas in the coolant tester that uses a vile with special fluid that changes colors if combustion gasses are migrating into the coolant via a gasket leak.