Recently like as in a couple days recent, upon cold starts and even sometimes when I'm driving the speedometer and odometer stops working the spoiler deploys (regardless of speed and won't let me lower it back down) and the bas esp , abs , brake wear indicator & brake light all turn on. Not too sure why but so far the only correlation I've found is that like I said upon cold starts it happens.

went out and bought a voltage meter to test the battery.

My first test was after I had already warmed the car up (I had to drive to the store to get the multimeter) and of course before I left out to go get it all the lights were came on during the initial cold start.

results:
Engine not running ~ 12.90 volts
Engine not running w/ lights on ~ 12.4 volts
Engine running ~ 14.02 volts
engine running with lights on 13.9 volts

P.s. I'll also make note that my car doesn't drive any differently because of any of this (besides not having abs and traction control) it drives literally no different.