Lithium VS AGM

Happy happy everyone. I’m getting some slow to start cranks in around 20 degrees mornings. I figure it’s time for new batteries after about 4 years with my AGM starting batteries.

I have an EPU and 4 batteries behind the sleeper (they’ve been run down quite a bit but still function but will need replacing before long). 4 starting batteries under the drivers steps. All AGM. My inverter is set to charge on AGM.

So, basically I’m not sure if I can replace only the 4 starting batteries.

Can I replace the starting batteries with lithium batteries?

If I put in lithium starting batteries and leave the older AGMs for the EPU do I need to worry about them charging differently? The inverter is set to charge AGM. I’m guessing the inverter charges the EPU batteries and the alternator charges the starting batteries.

Should I stick with AGM starter batteries?

I’ll likely need to replace the EPU batteries when summer comes along.

I know that’s a lot of questions but I don’t want to fry anything out.

 

honestly I’m not really sure. I know the controller for the inverter has settings for different battery types. I think I read that it charges the batteries differently. Ag is for AGM.