Will a better battery help subwoofer being too strong? Alternator voltage 12.8

[Ali2627]

2015 acura ilx 2.0L engine
Hi I have the Rockford p300 10 inch 300w sub and 100w HID kit along with 2 dashcams and a phone charger and tiny things here and there. My car with max accessories and sub going the voltage at the battery gets at 12.8 V and when i turn it off some stuff it goes to 13.8-14 V I have a flooded battery will an AGM battery help here or is my alternator just took weak? My car is having starting problems I suspect it's the starter but now after this testing maybe this is why?


Didn't happen before this started about 5 months ago maybe the battery is getting older?

Car battery is 2 years old
Group Size 51R
500 Cold Cranking Amps (CCA)

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[metalheadjoe 10+ year member]

Get your battery tested. All your problems point to a bsd battery.

 

[Popwarhomie 5,000+ posts]

100w HID kit

RIP projector bowls.


What do you mean by starting problems? Like doesn't want to turn over? What is voltage while cranking?

 

[Ali2627]

RIP projector bowls.


What do you mean by starting problems? Like doesn't want to turn over? What is voltage while cranking?

Haha the projector bowls are fine thankfully. Yes sometimes car doesn't start

did some tests also autozone tested battery was fine they said my alternator was bad somehow but i dont believe that. I suspect since my battery is flooded its not as effect to recharge and cycle compared to AGM and my car under max load weakens the battery but doesnt kill it enough for rare times the car wont start where i gotta click on and off a bunch until I assuming here builds up enough power in the starter solinod to get it started.
Car off battery reads 12.63 V
Car when being started (battery load) 11.08V
Car running with max accessores on 12.85V
Car running with no accessores 13.8-14V

SOOOO my question still stands anyone know a good AGM battery? thats size 51R with more than 500 CCA?

 

[Bobbytwonames 5,000+ posts]

Yes, get the strongest AGM battery that you can find and you should be good.