How do you test for a dead cell ?

ok so my charger is AGM , and it will take 100% , hmm i have my system out right now and stock alt in but my voltage is droping way low , all i have are slim line FAL fans and HID's as far as extra electrical , i wonder if the fans are too much , i just swap'd alts at autozone thinking the last alt was bad, and this one is falling dangerously low now too . . stock is only 90amp , maybe just too small , even with a KHC2000 ?

 
I was going to say it is a sealed agm battery //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif and I know you know better than that meter.
My old mechanic instinct took over before I remembered those batteries are dry cells.//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 
faulty ground maybe?
both alts are on the same ground? Also my stuff rests around 12.8v. I dont see harm in 12.5~.6v.
Mine rests at mid 12.8's, when I left my interior lights on for a few hours it rested around 12.6 and took a charge off my 6 amp auto charger for about a half an hour.

 
Still don't see nothing wrong with 12.5v. Some just rest different then others I suppose. I know my Dekas used to rest at 12.6 and now my D3400s rest at 12.6v.

 
get a battery load tester, they can be had for about $15-20.

edit* I pulled a bad yellow top out of my bank and i gained alot by removing the bad seed. addition through subtraction //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 
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