Battery charging/discharging

Okay, I made a thread on battery charging a while back, and have
one additional piece of information to ask about.

As a review, I have a LiTime 100 Ah lithium ion battery, a
Prgressive Dynamics power center in my Lance 1475 trailer, and a
2023 Acadia Denali tow vehicle.  When I had the trailer connected
to the battery and the fridge running, the battery app said it's
discharging with 5.93 hours of use remaining.  After connecting
the 7-pin to the running Acadia, the battery app then said it had
5.35 hours remaining.

Just to check that the trailer draw hadn'tt changed, I unhooked
the 7-pin and the ap then said 6.04 hours remaining.  This makes
me think that not only is the Acadia *not* charging the battery,
it's system is actually drawing *from* the trailer battery when
connected.  Maybe because the LiTime is at higher voltage, though
that's just a guess.

Any thoughts?

FWIW, here are the details from each of the three test cases...

7-pin        Power     Current   Voltage 
Connected    -220.1 W  -16.7 A   13.2 V
Dis-connect  -242.2 W  -18.5 A   13.1 V
Connected    -215.7 W  -16.4 A   13.1 V

And this was all with the battery SOC being about 98%.

--
Ted Heise      <theise@panix.com>       West Lafayette, IN, USA