Chassis Battery charging?

[Dan_Frisbie]

I usually do something in the RV on at least a weekly basis. It’s on our property, plugged in and I am in it quite a bit. Once a month or so, I run the generator and fire up the engine, allow everything to warm up just to avoid surprises.
A few weeks ago I went out to do this and the chassis battery was dead. Completely dead. Battery Boost did nothing. After a trickle charge, it seems to be okay with 13.4 vac and I have started the RV multiple times.
I thought that the converter would also charge the chassis battery. Either I am wrong about that or have a fuse/wire problem. Since the Battery Boost did nothing, does this confirm that maybe the converter/house battery is not reaching the chassis battery? I also read somewhere that Battery Boost can’t help a completely dead battery.

It is possible that something was left on after my Sister-in-Law was staying in the RV for a week or so. I have no idea what buttons she played with out there…

 

[RollingManCave]

IMHO: I am no expert on this but I think their is an Isolator that only connects the house battery to the start battery when the engine is running so I don't think your converter will charge the start battery. I put a charger on both batteries when in storage and turn the battery switch to off. It works for me but your system may be different.

 

[AbdRahim]

What is the condition of the house batteries? On some units the chassis battery will only charge once the house batteries reach 13.2 v.

 

[RollingManCave]

A fellow member thought all Lithium Batteries had low Temp protection. I replied but then both posts were deleted. I did give a general search link to Amazon so you could see that some do not. Sorry if that is why the post got deleted. Anyway, I went on to say that I think competition amongst manufactures is heating up so future batteries probably will all have it. I like to watch the videos where techs run the different makes and models though different tests, especially the vids where they take them apart and show you who is cutting corners or have dangerous design. One Tech tears them all down now because one that he gave a 5 star review on shorted out and when he tore it apart he was horrified at what he found. He called the manufacture who pulled the model of the line until a modification could be made.