RAV4 12-volt battery: where it is, how to jump it, and why it keeps dying

Quick picks

What the 12-volt battery does, and why a hybrid has two batteries

So every RAV4 Hybrid and RAV4 Prime has two batteries. The big hybrid battery powers the electric motors. And the small 12-volt battery is an ordinary car battery that runs the computers, the door locks and the lights.

Basically, the 12-volt battery is what wakes the hybrid system up. So if the 12-volt battery is flat, the RAV4 Hybrid won't turn on, even when the big hybrid battery is full. And Toyota's manual says you can't push-start a RAV4 Hybrid.

Now a RAV4 Hybrid has no alternator, which is the part that charges the battery on a gas car. Instead, a part called the DC-DC converter charges the 12-volt battery from the big hybrid battery. Toyota says the 12-volt battery recharges "while the hybrid system is operating." So sitting in Park with the READY light on charges the 12-volt battery too.

So this page is only about the small 12-volt battery. And I cover the big hybrid battery, how long it lasts and what it costs, in my RAV4 Hybrid battery life guide.

Where the 12-volt battery is on each RAV4

So every RAV4 Hybrid owner's manual from 2019 to 2026, every RAV4 Prime owner's manual from 2021 to 2024, and the 2026 RAV4 Plug-in Hybrid owner's manual put the 12-volt battery on the "right-hand side of luggage compartment." Toyota's own how-to video for the 2016 RAV4 Hybrid says it plainly too: you won't find the 12-volt battery under the hood. And both Prime owner videos below show the 12-volt battery in that same spot. The 2025 RAV4 Plug-in Hybrid is the same generation as the 2024 RAV4 Prime with a new name, so its 12-volt battery most likely sits in the same place, though no 2025 manual confirms it.

To get to the 12-volt battery on a 2023 to 2025 RAV4 Hybrid, Toyota says to open the deck board, which is the cargo floor panel. Then you unclip 12 clips and pull off the right side cover of the cargo area. On a 2021 to 2024 RAV4 Prime, it's the same job, but the Prime's right side cover has 13 clips. And on a 2026 RAV4 Plug-in Hybrid, the right side cover has 12 clips, like the Hybrid.

And something to note is that with a dead 12-volt battery, you may not be able to open the power liftgate. GoldenK9Campers couldn't open the liftgate on their RAV4 Prime in the video below. So the jump terminal under the hood means you never need to get into the cargo area to jump the RAV4.

How to get in and start the RAV4 when the key fob won't work

So with a dead 12-volt battery, the smart key may not unlock the doors. But a metal key is hidden inside the key fob.

1. Slide the release on the back of the key fob.
2. Pull the metal key out.
3. Use the metal key in the driver's door lock.

Now if the key fob's own coin battery is dead but the 12-volt battery is fine, you can still start the RAV4. On a 2019 to 2025 gas or Hybrid RAV4, Toyota's manual says to press the brake, touch the Toyota emblem side of the key fob to the power button, and then press the power button. On a 2021 to 2024 RAV4 Prime, you touch the area behind the buttons on the Prime's key fob to the power button instead. And on a 2026, you hold the key fob over the key symbol in the bottom of the cup holder. My key fob battery guide has the full steps for each year and the right coin battery for each key fob.

What to check when a RAV4 Hybrid or Prime won't go into READY

So READY is the light in the gauges that means the hybrid system is on and the RAV4 can drive. If READY won't come on, Toyota's owner's manual sorts the cause by what the lights and horn do. The steps below come from Toyota's 2019 to 2026 RAV4 Hybrid, 2021 to 2024 RAV4 Prime and 2026 RAV4 Plug-in Hybrid manuals.

First, check how you're starting the RAV4

1. Put the shifter in P.
2. Press the brake pedal firmly and keep it down. A message about starting should show on the multi-information display, the screen between the gauges. Toyota says that if the message doesn't show, the hybrid system can't be started.
3. Press the power button once, short and firm. You don't need to hold the power button down.
4. Keep your foot on the brake until the READY light stays on.

Then check what the lights and horn do

What the "Smart Key System Malfunction" message means

So the smart key system is what lets the RAV4 sense the key fob in your pocket. Basically, it's how you unlock the doors and start the car without taking the key fob out. Toyota's manual says a "Smart Key System Malfunction" message means the smart key system may have a fault, and to have a Toyota dealer inspect the RAV4 right away.

But I'd check the 12-volt battery first. Toyota's manual also says that with a dead 12-volt battery, the hybrid system can't be started using the smart key system. And in 5 NHTSA complaints on 2020 RAV4s, at least two of them RAV4 Hybrids, owners got a smart key warning along with a drained 12-volt battery. In two of those complaints, a jump got the RAV4 going again.

Now those 5 complaints are owner reports. But all 5 are on 2020 RAV4s, which the DCM drain bulletin T-SB-0089-21 covers, as I explain below. So if a 2020 or 2021 RAV4 shows the smart key message, I'd jump it, then ask the dealer to check that bulletin by VIN.

And keep in mind that if you unlocked the doors with the metal key, Toyota says the smart key system won't start the RAV4. So use the dead key fob start instead, where you touch the key fob to the power button.

Toyota's emergency start when READY still won't come on

So if the lights work and the power button responds, but the RAV4 still won't start, Toyota's manual gives an emergency start. Toyota says it's for problems like a dead key fob battery or a blown fuse, and only for emergencies.

1. Pull the parking brake switch, and check that the parking brake light comes on.
2. Put the shifter in P.
3. Without pressing the brake, press the power button to switch to ACC, which is accessory mode. On a 2026 with ACC turned off in the settings, turn the power to ON and then OFF instead, and do the next step within 5 seconds.
4. Press the brake firmly, and hold the power button down for about 15 seconds.

Toyota says that even if the RAV4 starts this way, the hybrid system may still have a fault. So I'd have a Toyota dealer check the RAV4 soon after.

Why a RAV4 Hybrid or Prime won't start on a cold morning

• A weak 12-volt battery gets weaker in the cold. AAA says a car battery loses as much as 35% of its strength at 32°F and 60% at 0°F. That's for car batteries in general, not a RAV4 number. But it means a 12-volt battery that was already low in the fall can quit on the first cold morning.
• READY takes longer to come on in the cold. Toyota says READY may flash for a while in cold weather. So leave the RAV4 alone until READY stays on steady, because steady means the RAV4 can move.
• The big hybrid battery can be too cold to start. Toyota's newer RAV4 Hybrid manuals, including the 2023 to 2025 and 2026 manuals, say the hybrid system may not start when the hybrid battery is below about -22°F (-30°C). The RAV4 Prime and 2026 Plug-in Hybrid manuals say the same. Then you have to wait for the hybrid battery to warm up as the day gets warmer.
• After charging or reconnecting the 12-volt battery, start from ACC. Toyota says to start the hybrid system with the power switch in ACC, and that the hybrid system may only start on the second try. I cover that in the after-a-jump section too.

So ultimately, the best fix for winter no-starts is a 12-volt battery that's fully charged before the cold hits. I'd check the 12-volt battery with a multimeter in the fall, and use a small maintainer if the RAV4 sits.

How to jump-start a RAV4 Hybrid or RAV4 Prime, step by step

So these are Toyota's steps from the 2019 to 2026 RAV4 Hybrid, the 2021 to 2024 RAV4 Prime and the 2026 RAV4 Plug-in Hybrid owner's manuals. The steps are the same on all of them, except for one extra step on the 2021 RAV4 Prime. You'll need jumper cables and a donor car, or a jump pack.

1. If your RAV4 has an alarm, keep the key fob with you. The alarm may go off and lock the doors when you connect the cables.
2. Open the hood. Then open the fuse box cover by pushing in the two clips and lifting the cover.
3. Open the small red cover over the jump terminal. Toyota calls it the "exclusive jump starting terminal."
4. Connect one red clamp to the RAV4's jump terminal.
5. Connect the other red clamp to the positive (+) terminal on the donor car's battery.
6. Connect one black clamp to the negative terminal on the donor car's battery.
7. Connect the last black clamp to bare, unpainted metal on your RAV4, away from the jump terminal and away from anything that moves. Owners use a marked bolt on the engine.
8. Start the donor car. Raise the donor car's engine speed a little and hold it there for about 5 minutes.
9. On a 2021 RAV4 Prime only, Toyota adds this step: with your RAV4's power switch off, open and close any door on your RAV4.
10. Keep the donor car's engine speed up. Then press the brake in your RAV4 and press the power button.
11. Check that the READY light comes on in the gauges. If READY doesn't come on, call a Toyota dealer.
12. Remove the cables in the exact reverse order.
13. Close the red terminal cover and the fuse box cover.

Toyota then says to "have the vehicle inspected at your Toyota dealer as soon as possible." And keep the cables away from the cooling fan while you work.

Jump-starting a gas RAV4

So on a 2019 to 2025 gas RAV4, the jump is the normal way. The red clamp goes straight on the battery's positive (+) terminal under the hood. And the black clamp goes on bare, unpainted metal away from the battery.

Using a jump pack instead of another car

Now a jump pack is a small battery pack with clamps, so you don't need a second car. On a gas RAV4, you clamp the jump pack right onto the battery under the hood. Morozov Automotive does exactly that with a NOCO Boost Plus GB40 on a gas RAV4. But on a RAV4 Hybrid or Prime, the jump pack goes on the red jump terminal and a bare metal ground, the same as cables.

What to expect after a jump or a new 12-volt battery

• Warning lights. Seeing a lot of warning lights right after a jump is common. The computers lost their memory, and Toyota says "some systems may require initialization," which means a reset.
• The PKSB warning. PKSB, the Parking Support Brake, is the automatic braking at parking speeds. I go through its reset in my PKSB Unavailable guide.
• The RAV4 may not start the first time. After the 12-volt battery is reconnected, Toyota says the hybrid system may not start on the first try, and "This is not a malfunction."
• 2026 RAV4 only. With a dead 12-volt battery, the 2026's electronic shifter may be stuck in Park. Toyota says a 2026 can't be towed then unless both front wheels are lifted.
• 2021 RAV4 Prime only. Toyota's bulletin T-SB-0056-22 says a jump start can set off the 2021 Prime's hybrid computer problem, which I explain below.

Why the 12-volt battery keeps dying on a RAV4 Hybrid or Prime

The reasons Toyota gives in the owner's manual

• Sitting. Toyota says the 12-volt battery drains slowly even when the car isn't used. "If the vehicle is left for a long time," the hybrid system may not start.
• Leaving the RAV4 in ACC. ACC is accessory mode, where the radio works but the hybrid system is off. If you turn the RAV4 off when the shifter isn't in Park, the RAV4 stays in ACC. Toyota warns that ACC can drain the 12-volt battery.
• Auto power off isn't a full fix. The RAV4 turns itself off after 20 minutes in ACC or an hour in ON with the shifter in Park. But Toyota says auto power off "cannot entirely prevent the 12-volt battery discharge."
• Things plugged into the power outlets. Toyota says not to use the outlets longer than needed with the hybrid system off. A dash cam in parking mode is the big one. My dash cam guide covers the hardwire kit with a low-voltage cutoff.
• A dealer-installed GPS tracker. Some dealers plug a GPS tracker into the OBD-II port under the dash, and it draws a small amount of power all the time. My dealer GPS tracker guide shows how to check for one in 10 seconds and how to unplug it.
• Lights and audio left on. Toyota says to turn off the headlights and audio when the hybrid system is off. The RAV4 also shuts the lights off on its own after about 20 minutes.
• The 2026's ACC customization setting. With ACC customization turned on, the 2026's multimedia system keeps running after you turn the car off, until a battery-saving feature kicks in. So on a 2026, I'd check that setting.

The Toyota bulletins for dead 12-volt batteries

So a technical service bulletin, or TSB, is Toyota's official repair instruction to dealers for a known problem. Two bulletins cover dead 12-volt batteries on RAV4s.

Basically, the DCM is the car's built-in cell modem that runs the Toyota app and the SOS button. And I cover the Toyota app itself in my Toyota app guide.

And something to note is that Toyota says the 2021 Prime's computer problem "may be a secondary condition." So the dealer has to fix whatever ran the 12-volt battery down first.

Now so far, there's no public Toyota bulletin for 12-volt drain on 2023 to 2026 RAV4s. But a dealer can search for bulletins by VIN, so it's still worth asking.

The RAV4 Prime recall for the part that charges the 12-volt battery

So recall 23V478 (Toyota's number is 23TB07) covers the 2021 to 2022 RAV4 Prime. The DC-DC converter, the part that charges the 12-volt battery, may have a damaged part inside that can short and overheat. Toyota replaces the DC-DC converter for free. Until the fix is done, Toyota told owners not to plug the Prime in to charge when it's below 41°F (5°C), or expected to drop below that. I cover this recall in my RAV4 years to avoid guide too.

Now you may also read about a 12-volt battery fire recall and a class action. Those cover the 2013 to 2018 RAV4, not 2019 and newer. So if you own a 2019 or newer RAV4, the battery fire recall and the class action aren't yours.

How often owners report a dead 12-volt battery, by year

So here's how many complaints to the federal safety agency, NHTSA, mention a dead or drained 12-volt battery, as of October 15, 2026.

So the 2020 RAV4 stands out. The pattern in the 2020 complaints is a battery that dies after sitting 1 to 4 days, the dealer tests the battery as "good," and then the battery dies again. Several 2020 owners name the DCM as the cause, which matches T-SB-0089-21.

And the 2021 RAV4 Prime has no NHTSA complaints about the 12-volt battery, even though Toyota wrote bulletin T-SB-0056-22 for it. And one owner of a 2025 RAV4 Hybrid XLE Premium has to charge the 12-volt battery for hours before every drive.

And on the 2026 Plug-in Hybrid, one owner got an airbag light and lost all the driver aids. That owner's 12-volt battery read 11.8 volts, and the warnings cleared after charging the 12-volt battery overnight. About 5 owners of the 2026 Hybrid and Plug-in Hybrid report a "System Malfunction" message with airbag and driver assist warnings all at once. Only that one owner tied the warnings to the 12-volt battery. I cover the 2026's early problems in my 2026 vs 2025 RAV4 guide.

What some owners believe about how Toyota charges the 12-volt battery

Now some owners believe Toyota hybrids keep the 12-volt battery only partly charged, so the battery wears out in 1 to 2 years. One 2022 RAV4 Prime owner logged their own 12-volt battery dropping to 12.3 to 12.6 volts after 90 minutes of driving. And while their Prime was plugged in, the 12-volt sat around 12.8 volts. Toyota hasn't confirmed any of this. But the theory is one more reason a monthly charge with a maintainer makes sense if your 12-volt battery keeps going low.

How to keep the 12-volt battery from dying

Everyday habits that help

• Put the shifter in Park before you turn the RAV4 off, so the RAV4 doesn't stay in ACC.
• Check that the RAV4 is fully off and not sitting in ACC when you walk away.
• Unplug the dash cam, or use a hardwire kit with a low-voltage cutoff.
• On a 2026, check the ACC customization setting.
• Keep the key fob away from the car if the car will sit, so the key fob doesn't keep waking the RAV4 up. Toyota UK suggests this.

Drive your RAV4, or sit in READY, once a week

So Toyota UK's advice for a hybrid that's sitting is to do two things at least once a week. Put the car in READY for about 60 minutes, and drive it for at least 30 minutes. Here's how Toyota UK says to run a hybrid in READY:

1. Keep your foot on the brake and press the power button until the READY light comes on.
2. Leave the shifter in Park with the parking brake on.
3. Turn off the radio and anything else you don't need.
4. Stay with the car. Toyota UK says not to leave a hybrid unattended in READY.

Now this advice is from Toyota in the UK, not a US Toyota document. The US manual only says the 12-volt battery recharges while the hybrid system is on.

Use a battery maintainer if the RAV4 sits

So a battery maintainer is a small charger that keeps a battery topped up without overcharging it. For longer storage, Toyota UK says a trickle charger is "a good option." And a Toyota UK reply from June 2026 says using a trickle charger doesn't affect your warranty.

Now Toyota's US manual has these rules for charging the 12-volt battery in the car:

• Disconnect the battery's ground cable if you charge the 12-volt battery while it's in the car.
• Have the charger switched off while you connect the charger.
• Charge only in an open area, not in a closed garage.
• Never charge with the hybrid system on, and turn off every accessory.
• Keep the charge to 15 amps or less for a quick charge, and 5 amps or less for a slow charge.

And Toyota's manual says the red jump terminal is for jumping from another car in an emergency.

But in practice, a lot of owners leave a 1 to 2 amp maintainer clipped to the red jump terminal and a bare metal ground under the hood. Other owners clip the maintainer right onto the battery in the cargo area, without disconnecting anything. Bob Pellerin left a ring connector on their RAV4 Prime's 12-volt battery so they can plug their maintainer in any time.

So ultimately, if you want to follow the US manual exactly, disconnect the ground cable before you charge. But otherwise, a 1 to 2 amp maintainer on the jump terminal is what a lot of owners use, and Toyota UK says a trickle charger is fine.

How to check your 12-volt battery at home

So a basic digital multimeter, like the Innova 3300a, tells you how charged the 12-volt battery is. With the car off and rested, here's what the reading means:

And Toyota's own check is a little different. With the power off, turn on the high beams for 30 seconds, then measure. A good 12-volt battery reads 12.0 volts or more at 68°F.

Now something to note is that "the battery tested good" doesn't end the question. Several 2020 owners got a good test result and then had the battery die again. Basically, a good test and then another dead battery points to a drain or a software problem, not a bad battery. And a load tester isn't the right test on a hybrid. Toyota's tech tip T-TT-0687-22 names the DCA-8000 conductance tester as the right tool for dead-battery diagnosis.

What to ask the Toyota dealer

So here's what I'd ask, word for word:

• "Please check my VIN for T-SB-0089-21." (2020 to 2022 gas RAV4 or RAV4 Hybrid)
• "Please check my VIN for T-SB-0056-22." (2021 RAV4 Prime)
• "Is recall 23V478 done on my car?" (2021 to 2022 RAV4 Prime)
• "Can you do a parasitic draw test with the car asleep, not just a battery test?" A parasitic draw test measures what's pulling power from the battery while the car is off.
• "Can you test the battery with a conductance tester, like Toyota's DCA-8000?"
• "Are there software updates for the hybrid computer or the DCM?"
• "Is my battery LN1 or LN2, and does the replacement have the vent hose fitting?"
• "If my RAV4 is under 3 years or 36,000 miles, is the battery covered by my warranty?"

And keep in mind that ToyotaCare, the free plan that comes with a new Toyota, covers roadside jump starts for 2 years. But ToyotaCare doesn't cover the 12-volt battery itself, because Toyota treats it as a wear item.

Which 12-volt battery fits each RAV4

So Ah, or amp hours, is how much the battery holds. And CCA, or cold cranking amps, is how much power the battery can give in the cold. Toyota lists the Ah and CCA as the minimum a new battery should have.

Now the LN codes translate to store sizes like this: LN1 is Group H4, also sold as 140R. LN2 is Group H5, also sold as 47. And LN3 is Group H6, also sold as 48. Confirm the size on your old battery's label.

So for the RAV4 Prime, Toyota's 2021 to 2024 Prime manuals all list an LN2, 55Ah, 345 CCA battery, and so does the 2026 Plug-in Hybrid manual. That's an H5 size. Optima also says the Prime "may be limited to the DH5," which is an H5 (LN2) size. The 2025 RAV4 Plug-in Hybrid is the same generation as the 2024 Prime, so it most likely takes the same LN2 battery, but check the label on your old battery to be sure. But read the label on the old battery before you buy.

How to tell whether your RAV4 has LN1 or LN2

So read the label on the old 12-volt battery, or ask a Toyota parts counter by VIN. Toyota's parts catalog lists both LN1 and LN2 batteries for the 2023 RAV4. And Toyota's manual says to "use a battery that the case size is same as the previous one," or it can't be held down properly. So I wouldn't swap an LN1 for a bigger LN2.

Why the vent port matters on the Hybrid and Prime

So on a RAV4 Hybrid and Prime, the 12-volt battery sits inside the car. Basically, a battery can give off hydrogen gas, so Toyota requires a vented battery with the vent hose reattached. Toyota warns that if the battery isn't installed right, "gases (hydrogen) may leak into the vehicle interior."

And most store listings for sealed AGM batteries don't say whether there's a vent port. So check for a vent port before you buy, and reuse the vent hose and plug from the old battery.

Do you have to buy an AGM battery?

So AGM, or absorbed glass mat, is a type of sealed battery. Toyota's US manual doesn't say the RAV4 Hybrid needs an AGM battery. And owners disagree on whether the factory battery is AGM. So an AGM battery meets Toyota's wording as long as it's the same case size and has at least the Ah and CCA Toyota lists. The AGM battery also needs a vent port. But you don't have to buy an AGM battery.

Batteries, maintainers and jump packs

So here are the 12-volt batteries, maintainers and jump packs worth looking at. Prices were checked October 15, 2026, unless I give another date.

Replacement 12-volt batteries

• Toyota genuine battery from a Toyota dealer (LN1 or LN2, by VIN). Here's the Toyota parts catalog page for the 2023 RAV4. The prices on that page look wrong for a 12-volt battery, so I'd go by Kelley Blue Book's dealer range instead, below.
• Interstate MTX-H4 is an AGM battery in the H4 (LN1) size, with 570 CCA and a 36-month free replacement. Interstate lists it at $279.95, and Pep Boys has it for $279.99. Interstate's page doesn't say whether the MTX-H4 has a vent port.
• Interstate MTX-47/H5 is an AGM battery in the H5 (LN2) size, with 650 CCA and 60Ah. Interstate lists the MTX-47/H5 at $279.95, checked Oct 15, 2026. Interstate's page doesn't say whether the MTX-47/H5 has a vent port.
• Deka AGM 140R is an AGM in the H4 (LN1) size, $229.95 at BatteryMart. The page shows two different CCA numbers, 545 and 760.
• Optima YellowTop DH5 is an H5 (LN2) size, 64Ah and 700 CCA. The DH5 was $359.99 at Amazon on April 17, 2026, and about $386.99 at JEGS. Optima names the DH5 for the Prime in its RAV4 battery article.
• EverStart Platinum AGM H5 is an H5 (LN2) size with 640 CCA, $189.00 at Walmart. This link is a Walmart search for the EverStart Platinum AGM H5.
• EverStart Maxx H4 is a regular flooded battery in the H4 (LN1) size, $159.84 at Walmart, but out of stock on October 15, 2026.

And keep in mind that none of these aftermarket listings confirm a vent port. So look for a vent port on the battery itself before you install it in a Hybrid or Prime.

Battery maintainers

• NOCO GENIUS1 is a 1 amp maintainer. The GENIUS1 is $39.99 at Continental Battery, and Walmart and The Power Tool Store list it for $29.95.
• NOCO GENIUS2 is a 2 amp maintainer, the one Bob Pellerin uses on their RAV4 Prime in the video below.
• Battery Tender Junior 800mA is a smaller maintainer, $41.95 at MAK Performance.
• CTEK CT5 Time To Go lists at $145.22 on CTEK's site, and Alconkits has it for $113.99.

Jump packs, cables and a multimeter

• NOCO Boost Plus GB40 is a 1000 amp jump pack, $99.95 at Walmart. The GB40 is the jump pack in Morozov Automotive's gas RAV4 video.
• NOCO Boost X GBX45 is another NOCO jump pack.
• Jumper cables. Any set works. This link is a Walmart search for jumper cables.
• Innova 3300a Digital Multimeter is a basic digital multimeter for checking the 12-volt battery's voltage, $23.52 on Innova's site, checked Oct 15, 2026.

What a new 12-volt battery costs at a Toyota dealer

So Kelley Blue Book's fair price for a 12-volt battery replacement at a dealer, on a 2024 RAV4 Prime, is $293 to $343. That's $176 to $206 for the battery and $117 to $137 for labor. That's for ZIP code 97701, checked October 15, 2026, on KBB's battery replacement page.

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