AGM Replacement Battery for Lexus GX550?

[Bluegill]

Hello, my battery is dead in classic Arizona style. Working fine when parked, deader than a doornail this morning. I was able to jump it with my portable jumper battery to get my wife & son to his first day of school, but she parked and shut the truck off and then it wouldn't start again. She couldn't get the jumper battery to work so I had to run up and get it done for her - the jumper barely started the truck.

I'd like to replace this OEM flooded lead-acid battery with an Absorbed Glass Mat (AGM) battery.

Looks like our battery is an H7 (Group Size 94R) 12-volt battery.

Duralast has a Platinum 94R / H7-AGM for about $250 (shopping the local Autozone website).

Duralast Gold 94R / H7-DLG is $215.

Optima has a yellow-top Size 94R / H7 DH7-AGM for about $380.

Any opinions? Thanks!

edit to ad for more information:

2024 Lexus GX550 put into service June 7, 2024, so it's 2 years & 2 months old. Currently has 30,000 miles.

 

[DJ’s Sled]

Dang!
Been wondering about the OEM battery quality too..esp in light of the (IMO) several cost cutting decisions and shortcomings Lexus made to this Gen 1 vehicle.
Excellent topic.
DJ.

 

[SkyHigh]

Have you checked the electrolytes in the battery?

 

[48Njim]

My observations of low battery voltages on the GX pointed my attention to parasitic draws. There's a lot going on with our ECUs, CAN BUS networks and sensors. We've all heard about proximity of digital keys, etc. Things should go to sleep but I've seen low voltages at start-up. I measured draws of 19ma which should be fine. Usually under 50ma is "normal" and shouldn't cause too much battery drain. However, I still feel like something is going on. I don't think the problem is the FLA battery or that Lexus skimped. (Surely they saved enough money with all the plastic crap.) I suspect the smart charging alternator is behind this. The 280amp capacity alternator is no joke but I'm suspicous of the charging profile.

Having gone around the block switching to FLA=>AGM a few times with several other Toyotas I went back to a Toyota FLA battery. Nonetheless, I do have AGM in my 200 Series, actually two, with a Redarc DCDC and full time solar panel on roof. I still hook up AGM specific (Odyssey) charger periodically to get the full 14.8 Volt charge profile.

If you switch to AGM, remember the GX550’s smart charging system is calibrated around FLA characteristics. The AGM upgrade should be better especially with periodic full 14.8 Volt charges from a maintainer.

[edit] another option for your consideration:
Odyssey => ODP-AGM94R H7 L4

Cheers,
Jim