I don't know the answer to that and don't have enough information to even hazard a guess.

 

I've had many years of experience with Marine 12V batteries. I have on on a golf cart that runs the lights and front and rear winches. The front winch got used on average 3 times a week to haul the 700-lbs of cart into my truck bed. After ten years of using, charging this battery, it finally died. And that was mostly my fault as I let the battery water level go below the plates.

The Marine battery is designed to have its power drawn out over a long time period. Think electric trolling motors on boats and such. Marine batteries can handle a deeper discharge compared to a "standard" battery.

A Google AI of "Lead acid Marine battery discharge compared to lead acid battery discharge" shows this:


Key Differences in Discharge:

• Design Purpose: Standard lead-acid batteries are built to start motors (high cranking amps), whereas marine lead-acid batteries (especially true deep-cycle) feature thicker, denser lead plates designed to be discharged down to 50–80% DOD.
• Depth of Discharge (DOD) & Life: Standard batteries damaged by deep discharges. Marine lead-acid batteries can handle consistent 50–60% DOD (approx. 12.0V–12.1V), with specialized types allowing for more, but all lead-acid batteries should be charged after each use.
• Peukert Effect: Both types suffer from the Peukert effect, meaning the faster you discharge them (higher load), the less total capacity you will get, though marine deep-cycle batteries handle sustained loads better.
• Capacity Loss: If a standard car battery is deeply discharged, it suffers irreversible damage much faster than a marine-specific battery.
• Marine AGM/Gel Exception: Marine AGM (Absorbent Glass Mat) batteries can be discharged up to 80% (20% remaining) safely, offering superior deep-cycle performance over standard flooded lead-acid.

So, I would think since the Lexus charge algorithm doesn't bring a regular 12V battery consistently up to a full charge, and I think...but I'd ask the battery experts first....that both a "regular" 12V LA and a 12V Marine battery can be charged from the same type of 12V charger, that the Marine battery would give you far better performance.

The regular battery can only handle so much deep discharge before it "dies". The Marine battery can handle much deeper and much longer discharges than a regular battery. And the AGM Marine is superior in handling deep discharges.

Should my battery require replacement during the warranty period, I'd look long and hard at spending the price difference between the two types of batteries. I just hate getting stuck anywhere, anytime in any vehicle.

 

Just to be clear, there is a difference between a deep discharge and prompt recharge and a long-term undercharge.

My understanding is that deep-cycle batteries are subject to sulfation and shortened lifespan when chronically undercharged, just like automotive starter batteries.

 

Yes. I understand that. My point is, if a regular lead acid battery is going to last 3 years and die from chronic undercharging, and during it's life, fail to start the car on several occasions, then wouldn't a Marine AGM battery that will fail in the same 3 year time period be better than the "ordinary" battery as it won't fail to start the car in that three year time frame?

 

Maybe. Maybe not. Wouldn't hurt to try it.