I have unplugged the battery and am still getting the low battery warning. Whether the battery is connected or not if I recycle the M1 power it does NOT clear the warning.
Unplugging the battery will definitely give you a low battery. The M1 is looking for at least 12.5 or 12.8 V (or something close to that) when it does its battery test. You need to have a good/charged battery there to satisfy the test.