Ionic Lithium 12V Group 31 3000 CA LiFePO4 Heavy Duty Battery

Why buy those for APU? Lot of other batteries that work well with APU that are a little cheaper. Just a FYI I might pull the trigger on them as well.

 

These are a little cheaper and have the stuff to add for APU if already installed. Heavy Truck and Commercial Vehicle Lithium LFP Battery For Electric APU
This is what I would most likely get for mine when time comes.

 

I think you will see that the LifePO4 batteries will drain into the AGM batteries. Not a big deal when running the APU during the night but might be a bigger issue when your truck sits without turning on.

If I was you I would just put them in the starting area and it will work better for you. If your APU is like mine it will help. My Starting batteries and EPU batteries all run at the same time until the starting batteries hit a spot and they turn off. This is one of the main reasons I want to add them into my system. Figure I would get 2 or maybe more for the starting and since they can run basically all the way down it would be perfect and never shut cab off. They also have built in Jump start.

I might pull the trigger in a couple weeks. Woke up this morning and had to lightly jump my batteries. Although they most likely just need to be cleaned and would had been no big deal.

 

On my last truck it was a regular thing as well. This one has not had any issues until lately. I gonna guess it is when the batteries try to work to hard and run down to far. I think I am gonna pull the trigger and go ahead and order those batteries. Had to jump the truck again this morning. Think I need to buy them before I get stuck with another set of AGM;s on the road.

 

Welp I just went ahead and pulled the trigger on 2 of them. Will see how they work and if I need to add another 1 or 2 I will afterwords. Will see when they come in and figure out what all I need to get them installed. I know I have a solar panel and not sure I can hook that up without changing the controller. It is a
ThermoLite® Solar Panel so I need to look up some information and figure out if it will work or not.