12v battery died after p0A93 code came up

so im not sure if I should mention this but all of this happened 2 days after i got my car play stereo installed with a backup camera. So yesterday while i was messing with the equalizer settings the car started blinking ( both screens) and I freaked out and turned it off. After a minute I turned the car back on it blinked and glitched out so I shut it off. After a hour or so I turned the car on ready mode and it went back to normal. After driving for a few minutes ( went to go pick up my girlfriend ) the car made a lil bump noise and the car symbol thing came up on the top screen along with red triangle, !, and vsc. I parked restarted and it was fine for the drive there and back but the lights did not go away. I also noticed that my light wheel thingie ( that makes the car dash lights low and high stopped working. When I got into my driveway my grandma told me my left break light was out but after inspecting it was not. Thats when I decided I was going to use my dads fancy scanner gun to figure out what was wrong ( he is a mechanic).
The scanner gun came up with a few codes
P0852
P0A93
and C2318 ( low voltage error power supply fault )
I cleared the codes and then i went to mc Donalds and they came back after a few minutes driving. I decided that i was going to go change out the battery because i read somewhere that the 12v may have starting failing. When i got to the shop they did not have any in stock so I went to go start my car and noticed now that all the lights are up ( including abs ) and this loud beeping noise that wont stop. So I park the car nearby at a grocery store and restart it and it would not ready anymore. I jump started the car and it started working with all warning lights gone. I drove for another 6 minutes trying to make it home fast when my car starting beeping and all lights went up. My car steering wheel locked up and the breaks stopped working momentarily and i almost crashed. This followed with the 12v battery shutting off. had to use the ebreak. After another jump start it went back to normal with a triangle and a check engine light. Made it home and haven’t touched the car since ( does not turn on without jumpstart ) Im sure if the 12v battery dying is related to the p0a93 code. What should i do now? Replace the water pump first or test the car out with the new 12v battery? I dont want to mess up the new 12v battery.