Just replaced mine today. Went with a Group 24F - EFB (Enhanced Flooded Battery). I fabricated a 14 gauge wire and alligator clip (both ends) setup, with a fuse inline. Used a donor 12V auto battery that I already had on hand. Worked well. No memory losses or weird issues. It's a bit awkward moving battery cables around with the jumper leads attached during the "surgery", but it's very doable.

 

Curious, what trim did you have to remove to replace the battery? Was this on a 4th Gen RX350?

 

Is this "trim" in reference to a 4th generation Lexus RX 350 12 volt battery ? Please show photos of this trim you had to remove.

I replaced my battery in a 2017 RX and did not see any trim or any obstacles of any kind. The old battery came out and the new one went in. A 5 minute project.

 

When changing batteries, I've found it easiest to just connect my (powered) Battery Tender cables to the 2 battery leads that are removed. This way there is no need to hurry with the new battery installation.

 

So, you're doing the same operation as me, except you are using a battery tender vs. an actual battery.

 

It not really a trim, but it's a cover (black). The black cover is covering the radiator and condenser. Don't know the exact name. It is covering the battery a bit. So removing it gives you a better access to the battery.

 

Interesting. I didn't experience that on mine. I just needed to remove the battery hold down, remove cables, and it was out. There was an access hole in the cover for the forward hold down bolt that made it easy to do.

 

Yep, just less cumbersome since the unit can just sit on the engine and the cables are very flexible. I assume everyone has some sort of a battery tender to use during vacations with so many Lexuses having parasitic battery drain issues.

 

My 12v SAE cable setup for my battery minder without opening the hood. Convenient.

 

I have mine exiting from under the rear of the hood, positioned between the 2 wipers, and just barely sticking out so it's not noticeable.

 

Mom taught me not to drive around looking that. I just tuck it under the front license plate and out of sight the malcontents who want to act upon their malicious intent.

 

Considering the common parasitic battery drain, Lexus should install as standard a trickle charger with wireless charging. Or perhaps a tiny under-the -hood gas-driven generator that turns on when the battery voltage drops.

 

Let's all hold our breath on that one.

 

The 12V SAE cable has a 15amp in-line fuse which definitely trumps the wireless charger scenario. The SAE is designed to handle freezing and harsh conditions.

https://a.co/d/2J6LRMD

 

My wife and I were in the WV mountains on Columbus Day weekend when my 2020 RX350 got a "Parking Support Unavailable" error when starting the car. I turned off PKSA and we drove to WV's highest point (Spruce ****) late in the afternoon. It's not a place you'd want to be with a dead battery. I wasn't thinking battery, though, although I'd remarked to my wife days earlier that I needed to replace the battery soon. It's 4.5 years old and I've had a dashcam with parking mode installed for 4+ years. I thought the error might be related to my bike rack, even though the rack has been on my car for a couple of years without issue. (I do keep PKSB turned off all the time because it alerts when bikes are on the rack.) Anyway, the error did not recur when leaving Spruce **** after turning on PKSA and I didn't think any more about it.

The next day was colder (~40F), windy and rainy. I load the car to go home, using the power rear door without issue. We go to leave and .... back comes the "Parking Support Unavailable" message, but this time it's accompanied by the unmistakable starter rattle of a dead battery. Not good - it's late Monday afternoon at our condo and not another soul is around. Fortunately, I had a Chineseum jump box in the trunk that I'd fully charged in February and it still showed a full charge. I hooked it to the battery and it started immediately. We drove through AutoZone on the way home and bought their Duralast 24F AGM. After I replaced the battery the "Parking Support Unavailable" error occurred on the first start but has not recurred. The vehicle was without power for at least 5 minutes during the swap and no settings were lost, at least that I have noticed.

Lessons learned: 1) Trust your gut. When you have that "I should replace the battery" thought, do it. 2) Never be without a charged jump box. Even if you never need it, you might be able to help someone else.