I would get a battery minder/maintainer on that battery ASAP, or disconnect the negative battery connection whenever it is shut down. At least until you sort out a few things.
The most likely cause of the low battery alarm is either (1) a defective new battery, not that unusual, or (2) an alternator that is failing to recharge the battery, or (3) a bad connection from the alternator to the battery, or (4) a mystery current draw.
And in a 2016 truck, we can never rule out a TIPM fault. Let's save that one till the other suspects are cleared.
(1) The SOP for this condition is to load test the battery with a toaster-style load tester like this $18 device from Harbour Freight. The digital testers used at parts stores and elsewhere are prone to false positives.
Amazing deals on this 100 Amp 6/12V Battery Load Tester at Harbor Freight. Quality tools & low prices.
www.harborfreight.com
(2) The alternator can be tested at a parts store for free.
(3) YouTube has video tutorials on voltage drop tests. One of them will include the large B+ wire from the alternator to the battery. A digital multimeter will be required for this test. A quick check that all connections are clean, corrosion-free, and snug may be attempted first and could identify a problem.
(4) The mystery currents are usually caused by a module that fails to sleep when you shut down the engine. They're not too difficult to get sorted out, but can be a bit tedious. I would suggest you start at the beginning with the easiest to the more tedious tasks.
Load testing a battery with the identified tester is inexpensive, painfully easy, and is a great piece of test gear to own. I've had 2 of them for decades.
Any questions?
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