I am at around 59000 k for my 2021 RDX. Any experience on when the AGM battery will die?

For my 4G TL, it was like clockwork at 4 years (10 000km/year).

 

I got a little over 4 years from the origional battery. There is little to no warning when the battery is about to die. Here is a excerpt from that thread I posted in Jan 2025.
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Just replaced my RDX vehicle battery. Size wise, its a: AGM Automotive Battery, Group H6 / LN3 / 48 12 Volt, 760 CCA

My Warning signs:

• Slow cold start up that would pause for a millisecond and not enable the seat to automatically go into position (had to use the memory button on the door).
  • This all Started 5 days ago - Based on this - I knew my days were limited before it would not start.
• Auto/start stop - stopped working about 2 months ago.
• 55 month old OEM battery, thats seen -10 degree temps to 112 degree temps.
• Probably would of lasted longer with a trickle charger on it while in the garage - but thats a pain in the butt.

Lots of options out there:

• Acura dealership was the most expensive option ($300) - 2 year warranty once your Acura OEM warranty expires (mine did in December of 2024).
• Autozone and Advanced auto parts were the same, about $244 with a pro-rated 3 year warranty.
• Costco was $178, however they do not install.

Best bang for the buck was Walmart, with a 4 year replacement and free install for $178. Plus there are tons of Walmart in the USA (if traveling).
EverStart Platinum AGM Automotive Battery, Group H6 / LN3 / 48 12 Volt, 760 CCA

https://www.walmart.com/ip/EverStart...R&athbdg=L1200

NOTE: You will have to reconnect the entertainment system to the vehicle after the battery is disconnected. Simple, just start the vehicle - turn the entertainment system on - then "push in and hold the volume power button" for 3-5 seconds and it will reconnect.
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I bought a for each car (only used on other people's car so far) and a . I view the battery tester more as qualitative than exact. With those, I feel that I can wait until I start seeing some degradation before I bother to change out the battery proactively.

I have a charger that I use to keep a car battery topped up, if I haven't driven the car in a week.

By coincidence, my VW takes the same battery as the RDX (different manufacturer from factory). After nearly 6 years it still tests "good," but CCA has dropped by about 20%.

 

Some people feel that the auto start/stop feature acting erratically, not engaging in particular, is an early warning sign of a battery issue. The discussion can be found at AIS not engaging…battery issue

 

We got about 4-5 years from the OEM battery.

 

Believe, not positive, my battery is on it's way out. My 2020 RDX had been sitting for 5 days and figured I would put it on the trickle charger. It wouldn't charge, so I thought I would take it for a run. It started fine and took it out on the highway for about 15 minutes. I ran a couple of errands and then headed home and hooked it back up to the charger. It then took a charge and completed a full charge cycle. I looked up my charger instructions and it says that if the battery charge is less than 30% or has a damaged cell it may not charge. So I think I am on borrowed time. Need to decide on which brand and when.

 

I am 6 years on original battery, I am living dangerously!

 

Both of yall, just do it! LOL

It was coming up towards winter and I could sense it getting low and didn't want to set my wife up.$220 insurance isn't bad lol

 

My OEM battery was 2 years old when the AIS stopped working, and that is on par with what I got from a battery on my previous RDX (and really every car I've ever owned). I live in the Phoenix area - the summer heat is just beyond brutal on our batteries. The only battery I've ever had beyond roughly 2 years was on my Chevy Cobalt from some time ago, and I suspect the main reason is that it was in the trunk and not the engine bay. That was 5 years old, and was only replaced because it was damaged when someone rear-ended me.

 

We bought our 2020 RDX from friends at the end of their lease and believe the in service date was July of 2019, so I would be at 6+ years as well.

I hear you. It’s my vehicle and I WFH so no immediate need but will be done soon. I always replaced my batteries with DieHards but the last one I replaced was an Interstate on my TL-S.
Just need to compare specs, prices and warranties before pulling the trigger.

 

We got our 2020 in Oct. of 2019 and the battery still seems to be holding up well. The damn idle stop even still works when we forget to turn it off. I do keep a jump starter in the rear storage area, getting to it could be an adventure though if the battery is dead and the hatch won't open.

 

2019 AWD Tech. Noticed no issues in 6-1/2 years / 65K miles, but with winter coming up decided to proactively replace the battery. As others have said, the failure happens with no warning, and I did not want to get stranded at some odd time, like leaving for the airport or other time sensitive occasions. Bought from Costco, installed at a local mechanic.

 

As one can see the battery life numbers are all over the place. I personally think some of that may be related to how often the ESS (engine start-stop) is allowed to function. One observation I’ve made with my 2022 RDX, and I’ve done this on purpose, is to drive roughly 10 miles (14 traffic lights), both with the ESS allowed to function and also with it disabled. The vehicle is not used on weekends so a maintainer is on the car. When I’ve driven for 5 days with ESS engaged, it typically takes 15 to 18 hours for the maintainer to indicate a full charge. If I drive the same route, again for 5 days with the ESS disabled, the maintainer indicates a full charge after about 4 to 6 hours. To me this is just common sense behavior. Defeating the ESS allows significantly less battery drain. In my “test” if 1/2 of those 14 traffic lights stop me, and they do, and the ESS is allowed to function, that means 7 restarts of the vehicle (+ 1 when I leave the house). If ESS is off, then I have one start and its drain on the battery.

 

Ours has 145k on it, wife uses it to commute and we use it pretty much on the weekends too. It's kept in a garage and her driving is highway, so The stop start isn't working much at all or she turns it off and i drive in Sport +.
So I think it just comes down to manufacturing of the battery in the end.

 

I'm still on the OEM battery at just over 6 years with a lot of short trips - at the last dealer visit they did warn that the charge was getting low but they quoted some absurd number for a replacement (over $500). As I live down the street from a Costco I'll just wait till I have my first problem and pop over to Costco to get a new one.

 

Just my 2-cents - You won't get any warnings, besides one time it decides not to start (been there). Being proactive eliminates getting stranded at not a good time - which can be costly too. Otherwise, carry a jump box with you.
Both options are less expensive than a tow truck. As noted in a thread above, there are much better options than the dealership with a better coverage.

Plus - Cold weather will suck the cranking amps at a cold start.

 

Thanks, that's a fair comment. In my neck of the woods I'd have plenty of easy options to get to the Costco even if I'm out and about - car share, Uber, walk over, get a lift from the in-laws such that even if I do run into a problem I wouldn't be hung to dry. That said, I should bring my jump box with me as winter is coming (we still have very mild winters though).

 

My AIS has not been engaging for a while and with my 2022 Aspec Adv original battery, I decided to replace it with winter coming. After reading the posts, I had the AGM Interstate put in at Walmart $190 out the door. I thought my AIS would start working again but I still get the charging error that comes up and I just turn end up pressing button to turn it off. Any reason why new battery hasn’t fixed this?

 

Maybe battery is not the problem, alternator?

 

Are you over on miles to exclude this being covered under warranty? With a 2022 you should be covered on the bumper to bumper warranty by time, not sure about mileage.

 

What type of driving do you do? Is it sufficiently long in duration or distance to properly charge the battery?

 

Thanks to everyone for the responses! The AIS just started working again. It’s about 3 days after new battery installation and my guess is that the new battery may not have been fully charged off the shelf? If that was the case, then the alternator did its job 👍🏻

 

Just my 2 cents, but consider disabling the AIS when you drive the vehicle. The benefits are somewhat limited in terms of improved economy but your vehicle may be equipped with a heavy duty starter and the oversize AGM battery. I don’t know about Acuras but some engines are designed to handle the increased wear from frequent restarts, such as oil-retaining bearings and low-friction coatings, especially for the crankshaft and rod bearings. In turbocharged engines, the system may include extra components like oil circulators and coolers to prevent oil degradation after the engine shuts off. There is also the question of the impact on oil life. I suspect the algorithm that calculates oil life integrates the stop/start cycle into the oil life calculation.

 

My AIS is always disabled. I believe your battery and starter will last longer. Its just not worth the tinny savings you get on gas

 

Appreciate the “2 Cents”! I’m not a big fan of AIS - in fact, I manually disable it quite frequently. My concern was more with why it wasn’t engaging after replacing the battery, ie. could it be a sign that maybe the alternator was the real issue. Thankfully, it is now working so I think all is well with both the battery and alternator 🤞.

 

Your new battery might have been partially discharged after sitting on the shelf for a bit. With everything good now, I’m sure the alternator did its job and topped off the charge.