[Richard]

I gotta echo what Forest asked. Your battleborns were at 14.4 while being charged, or while at rest? Cause if you are keeping the lithiums at 14.4 all the time, then you have a bigger problem.

As far as the Limiting Max Voltage
An Overvoltage Protection feature automatically limits the maximum starting battery voltage to 13.8 volts, regardless of the house battery voltage. This allows conventional lead-acid starting batteries to be safely used in conjunction with LiFePO4 house battery chargers that may constantly produce in excess of 14.5 volts. http://www.lslproducts.net/ALS_Overview_Page.html

I am kind of an old school guy so here is what I would do. Turn off the AmpLStart (ALS) Discharge the Walmart 12v Battery a bit, maybe down to 12.5. Right now it's topped off so you don't know if the AmpLStart even thinks it needs charging. Measure the voltage at the Walmart. Tunr the ALS on, does the voltage on the Walmart start to rise? If so the ALS is working, leave it working and see if it shuts off, or changes from charging to maintaining, when the Walmart reaches around 13.4

I don't have one of these, and there are two points in the manual that confuse me. One is the lithium jumper and how it changes the turn on and turn off voltages. Is that voltage on the house bank or chassis bank? The second point which is confusing to me is the manual seems to indicate to me that the only time the ALS charges the chassis batteries is IF the house batteries are being charged.

Time to call the AmpLStart folks.