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12V battery replacement recommendations.

50K views 54 replies 21 participants last post by  Mark in NY  
#1 ·
What are recommendations for a replacement of 12V battery?
costco , Walmart or auto parts store?
Get a bigger or same battery?
 
#2 ·
First, just why is your 2019-22 RAV4 Hybrid needing a new 12v battery? The hybrid is really easy on batteries, as it does not use them for starting the Hybrid Synergy drive train. The 12v battery serves to start the computer and as a buffer for the various 12v stuff that a conventional vehicle needs.

I have seen references to both Hybrid and Prime 12v batteries. Hybrids made in USA get an AGM battery of late. Costco, Sams have them I think. If you want a standard fitment, the OEM AGM size is fine. J (japan) built vehicles got a flooded lead acid battery with pressure valves. That one, Yuasa is expensive as heck in USA and really not useful IMHO. I suspect its a VERY fine battery, but not really the battery a Toyota Prime needs.

You are under warranty still I suspect. If yes, then ignore most of the rest of this post. But since the Toyota hybrid system does not have a conventional 12v starter to start the gas engine (uses the traction battery) the 12v battery never sees "starter loads". That's what starter batteries excel at. But they are short lived and HATE deep discharges. Prius drivers have been swapping in deep discharge motility(wheelchair) batteries which cannot provide starter current, but are tough and cheep. Did my first swap in 2014. Zero issues at 8 years.

If you are handy and want to save money and actually improve the battery life, you can retrofit a mobility battery into the vehicle. Under warranty, I'd go get an AGM from Sams or Costco. If you have a J at the beginning of your VIN you most likely have a rather weird battery.. Don't try to buy a identical replacement. It will hurt.

Easy answer: Any AGM listed to fit is the way to go. Find the best price. Batteries are heavy and location makes price vary.
 
#14 ·
Are you saying Kentucky built RAVs are AGM? I know it's a different ballgame with these hybrids, my rule of thumb is to change after 3 winters. We'll see if more battery threads appear on the forurm, if they don't I'll move the replacement interval back.

I've had batteries that were dead and needed to be jumped only to be told by the dealer that it's holding a charge so to avoid all the nonsense, changing after 3 winters has worked well.
 
#12 ·
Starts with T so it’s Canadian.
car battery died after 2 weeks of not driving a car .
is this an indication of failing battery?
2 weeks ? yup, battery on it's way out. or as others say, you have some unusual parasitic drain

in Texas heat when battery went flat after one month sitting (non hybrid) that was a battery at end of life
they should keep a charge far longer than that.
 
#13 ·
I have a rear view camera activated by sensor.
I have a Costco type s jump starter that works well with hybrids.
my top vision jump starter did not start my car because hybrids need a trickle of current to run computer and lights
Rear view camera activated by sensor. Just what keeps the sensor working? Is it on a switched circuit? Are you sure? Just cause the head unit switches off, does not mean that someone did not wire the rear camera directly to the battery. Just my thinking out loud........
 
#16 ·
camera sensor takes 12v constantly.
I remember battery showed low on load test at some oil change service.
ill change it.
I assume I go to Walmart and talk to sales person.
Well, you probably should get a new battery then. Batteries that a frequently partially drained due to load like a camera that stay on after ignition is off, usually die a young death.

If there is no way to turn the camera sensor off, then I'd suggest getting a trickle charger and a "pig tail" and wiring the pigtail to the battery in back. If you get one long enough, it will be easy to pull it out from the spare tire well and over the bumper and then you can close the gate and plug in your trickle charger. Which you should do when you are away for longer periods, say over 5 days.

Again, 12v lead acid batteries of the kind you will get as a direct replacement to your current one HATE being stored or left at partial discharge for any period of time. Optimally functioning auto electrical systems recharge the 12v to full charge after each starting (moot with a Hybrid, but just saying), and then when the vehicle is shut down, have very little drain. A lead acid battery will still start your hybrid with only 20% capacity. But having it at 20% capacity for days will damage the battery.
 
#23 ·
in the top right corner of car's data nameplate it says 08/19 so I assume its build date .

CarPlay only

Its a Hertz bankruptcy car so it was sitting during covid before I bought it. then I discharged it by keeping it in acc mode and charging my cell phone, then it died during my vacations. battery shows 12.5 V after driving for half an hour and recent trips. Ill change it cause scotty said poor battery may mess up electronics. I am passed 36k miles so no warranty there.

I assume I should change with similar battery
Image
 
#24 ·
#28 · (Edited)
I am gonna admit up front that the HV battery pack is a pure black hole for me. With a Prius, they are remarkably reliable.

As for the install of a mobility/wheel chair battery in a RAV4, I have not been there. But here would be my approach:

1) Measure the height, depth and width of the existing battery. Make note while still in the vehicle how much "wiggle room" is present and record that too.

2) Start looking for a proper physically sized AGM mobility (that is the common industry term) battery. There are spec sheets from various manufacturers that describe their battery characteristics. Size is what matters. Too big, no luck. Too little, still maybe OK. The Prius swap involves a short piece of 2x4 under the battery so the tie down works!!!!!

3) On that spec sheet, there will often be "R" designations, IIRC. This refers to the location of the + terminal when looking at the battery with the terminals toward you (I think). Having the terminals in the right location is super important, as it allows you to make relative minor modifications to the existing hardware. You need an "R" battery for RAV4 (I edited this post minutes after posting, cause I was feeling uncertain about this left versus R post. My Prime is as I describe, having pulled out the battery cover just now)

4 Bolt on or screw terminal are best, IMHO. Why? Because, you would have to be INCREDIBLY lucky that you could get a drop in replacement for the OEM battery (which has old fashioned clamp terminals in the smaller JAP standard) But if you have a bolt or tab with a hole, or screw, or whatever, you can fashion an adaptor bar to the factory wiring harness.

5) Adapter bar. You are on your own for this. Must be handy, and if I ever do it, I'll take pics and supply instructions. But for a Prius, I used a heavy piece of copper (flattened 1/2" copper water pipe) and was able to create a little 90 deg twist that allowed me to use the existing wiring with zero mods. All the parts are still present to go back to original OEM battery. THIS is why I caution about this swap. The battery details are pretty easy, but you have to be kind of handy and able to think "outside the box" to get the battery hooked up. We are all used to just dropping a new battery in, cleaning the terminals, perhaps applying anti-oxident if you are good, and putting it back together.

The swap makes you figure out how to connect the two. If you are an electrician, its worth a try as I am sure you wont hurt yourself or the car!!!! Regular owners should be a little reluctant to undertake this. But I'm betting many handy folks could do it. I had some basic idea that it was do-able for a Prius. The connection bar was thought out on the go. Some other Prius owners permanently damaged the factory hardware in the process. I am no fan of that.
 
#34 ·
My2019 RAV4 battery died after having radio on for hour and half
Jumped it started right up
Question is does that mean l need a new battery?
Will driving charge battery back up
1. Although a battery can be damaged by running in down, it takes many of those episodes to make the battery unusable. You don't need a new battery quite yet.
2. Any time the hybrid is in ready mode, the 12 volt battery will be charged if needed.

If you still have the OEM battery, OEM batteries seldom last more than 4 or 5 years, so you may need a new one soon. Heat and cold affect the battery life the most, so if you live in the desert southwest, or far northern states, look to replace your battery sooner.

You might get a jump pack to carry with you in the car. You can get good ones for under $100.
 
#37 ·
A little after 3 years buying new, my 2021 RAV4 Hybrid would not start, locks wouldn’t work, totally dead. There were no noticeable symptoms leading up to it. Got it jumped and dropped it off at the dealer to check things. They said the battery passed the first test but failed the second, so they replaced it.

Also, they noticed the head unit was randomly rebooting so they updated it per TSB-0019-21. I had noticed nothing wrong with the HU but perhaps the battery drain brought it out. They implied the HU could have had something to do with the battery drain but, looking up this update, I don’t see that as one of the problems associated with this update. Cost about $450 total. First problem I’ve had with the car since buying.
 
#38 ·
2021 RAV4 Hybrid
They said the battery passed the first test but failed the second, so they replaced it.
. They implied the HU could have had something to do with the battery drain
You may need the well known TSB for the Data Communication Module (DCM). Your '21 hybrid is covered by it. That DCM caused much havoc and heart ache and dead batteries in the early years of this 5th gen forum and there are MANY threads and posts about it. The TSB repair is a simple 1 to 2 hour software reprogramming by dealer Techstream of the DCM.
 

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#46 ·
How many years will a 12V battery last in a 2023 RAV4 Hybrid, given that it's not used to start the vehicle since the hybrid battery handles that?

If I will be out of the country for 3 months and nobody will start or use my RAV4 Hybrid, will the 12V battery have sufficient charge upon my return without a battery maintainer? How many months will the hybrid battery last before reaching a deep discharge scenario?
 
#47 ·
Disconnect the negative cable on the 12 volt battery while you are gone. The battery should be good when you get back.

You may have to reinitialize some items shown in the owners manual.

When the Air Force sent me to Turkey for two years (long ago), I just disconnected the battery and everything worked when I go home and reconnected the battery.
 
#50 ·
After 1 Year: If the hybrid battery self-discharges at a rate of about 1-2% per month, it might lose up to 12-24% of its charge over a year. Given that my hybrid battery starts at 3 out of 8 bars, this could mean a significant reduction in charge, potentially leaving the battery at or near the lowest charge levels (0-1 bars). I'm not that confident that it will be sufficient to start the vehicle.
 
#51 ·
Never heard of a 'hybrid battery' discharge being a issue over a long term.
I'm not that confident that it will be sufficient to start the vehicle.
HV battery discharge is not an issue. Don't worry about it. Unlike the 12 volt battery, there is nothing that discharges the HV battery when the car is off.

In the US (yes, I know you live outside the US), there is an HV battery warranty that is very long (years, not months). If the HV battery looses capacity during the time you are away, it should be covered by that warranty.
 
#54 ·
It seems you guys are saying the large hybrid battery starts the car. What am I missing?
As it has been said on this forum, the large Hybrid battery "starts" the ICE and the 12 volt (small) battery starts the electronics. Which in turn allows the large battery to work.
 
#55 ·
As a related bit of info related to the initial post on replacement battery recommendation....
A company called Ohmmu sells Lithium 12 volt batteries for replacement in EVs and PHEVs. I read the reviews primarily from Tesla drivers and then installed one in my Prius Prime a few years back. Seems a worthwhile move for my Prius Prime since the OEM battery measured only 65% life at my local mechanics shop. I will be looking into a replacement for my newer RAV Prime in the future and will end up purchasing the same.