Battery Advice Please

I’ve never seen a battery put out 13+ volts. My healthy batteries usually read 12.5-12.8v. I also wish the Tundra alternator charged at 14v+ but they don’t... my charging voltage ran 13-13.5v before adding a HKB voltage booster for my AGM battery.

 

Correct. Didn't have my morning coffee and confused the numbers. I haven't tried on the Tundra, but Alternator voltage for my Honda Odyssey was 13.5V

OPEN CIRCUIT VOLTAGE
% CHARGE FLOODED AGM
100 12.70-12.60 12.8 or higher
75 12.40 12.60
50 12.20 12.30
25 12.00 12.00
0 11.80 11.80

 

A buddy of mine had a draw on his escalade. It was blamed on his aftermarket stereo so he got a new one and had the same problem. He tried over and over but no one could figure out what was going on. Eventually he just started pulling the radio fuse out when he parked for the night. Did it for at least 5 years like that.

 

Dealer is full of **** and lying through his teeth. He gave you the spec and his measurements, and his maximum measurement is only over spec by 0.08ma? wth? Remote starter guys test the battery and CCA is half?

Let me guess...This Tundra is a late 2018 or 2019, right? (Yep. I see it in your OP now...2019.) Removing the remote starter may fix the problem now, but as this battery continues to decline (won't be long), it will continue to be a problem. Toyota needs to own this freaking battery problem, or quit putting them in their vehicles.

Buy yourself a cheap battery tester like this one, and test the battery yourself. Remote starter guys are likely correct:

$40 ANCEL BA101 Car Battery Tester, 12V Digital Automotive Alternator Meter Diagnostic Tool,100-2000 CCA Load Capacity, Charging & Cranking Analyzer for Truck, Boat, RV, Marine Vehicle, and More

https://www.amazon.com/gp/product/B01M0ARG3X/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I would advise buying a Northstar NSB-AGM27F, but these are not easy to find anymore. If you can find one, it will be your best option. You may have to make a few contacts. I made a couple for you and came up empty. Also, buy a CTEK 7002 smart charger for when the truck is not being used.

 

@BobsonDugnutt here is additional data on Tundra Gen3 batteries. Since about 2015 or 2016, Tundra batteries have an average life expectancy of 24 months. It is clear from the statistical poll data taken here:

https://www.tundras.com/threads/original-battery-life-gen-3-tundra.48235/

 

Just an update, I’ve had the remote starter hooked back up for a week now and have not had the issues of the truck not starting. Hasn’t been quite as cold as it was when I had the issues, but cold nonetheless.