AGM battery's have been around since 1985. They have improved over the years. They are expensive but very reliable, charge very quickly and they hold up better under vibration. You have to weigh your priorities when maintaining your car. It's a personal choice. I replaced the battery in my wife's 2014 Sonata 2 years ago. Her car came with an AGM battery, it was 7 years old at the time, still in decent shape.

 

Looking to change my battery to an AGM soon.

However, I’ve read somewhere that these AGM batteries desire a 14V+ system. Anything lower than that will decrease performance or whatever.. the RX is just at 13.6/7V.

What do y’all think?

 

The AGM battery has a different internal configuration compared to a standard battery, but it is still a lead/acid battery which is 12.6 volts. It has 6 cells connected in series at 2.1 volts per cell. When you say "14V+ system" you might be referring to the charge rate immediately after starting the car which is normal. I don't know where "13.6/7V" comes from. Maybe you could point to the source of these numbers for further clarification.

 

Correct, the charge rate. I’ll have to find the thread about it.

 

How is this holding up? I am looking for a new battery.

 

Yes, you are correct. The 12v battery in a hybrid is only used to power some electronics at start up. It is meaningless to talk about cranking power of the the 12 volt battery. Very little strain is put on the 12v battery so it should last significantly longer unless the battery has a defect. Hybrids do not have an alternator or starter motor, because all of that is handled via the 240 volt hybrid system.

 

Is this true for all 2017 RX350 types? I'm trying to determine if I should get a flooded or AGM type for my 2017 RX350 base.

Thanks

 

Yes, all 2017 RXs have a regular flooded battery.

 

I went with an AGM battery in my 2017 RX. It costs more but it should be more reliable, last longer and it's shock resistant. The battery is the weak link in the electrical system of your car so I don't mind spending a few extra bucks. Here is a good blog comparing flooded vs. AGM:

https://www.power-sonic.com/blog/flo...e-differences/

 

A sound idea, but my only question then is: is there any risk that the Lexus battery charging system in a 2017 RX350 could overcharge an AGM?

 

Not at all. The charging requirements of both types of batteries are the same.

 

Yes, usually it's the vehicles with start and stop or hybrid vehicle that comes with AGM from factory.

Is it beneficial to install an AGM battery in a vehicle that doesn't require one? That is for you to be the judge. As for me, it is not worth it.

 

I haven't replaced the battery in my 2020 RX yet but have kicked around doing so with an AGM when the time comes. Longevity is the key reason. The AGM battery in my wife's Honda Pilot with 106K miles is 6.5 years old and still going strong. Of course, there's a difference between thinking something and spending the dollars to do it.....

 

They need to tweak the charging settings via the obd2 port for the agm battery. Most lexuses after 2012-13. Most battery places can do it.

 

Post #86 says you don't have to do that. ??