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What is the voltage of battery of Lexus RX 350?

The battery in a Lexus RX 350 typically has a voltage of 12 volts. This standard automotive battery provides the necessary power to start the engine, run the vehicle's electrical systems, and charge the battery while the engine is running.


Understanding the Battery in a Lexus RX 350


The Lexus RX 350 is a popular mid-size luxury SUV that has been in production since 1998. Like most modern vehicles, the RX 350 relies on a 12-volt lead-acid battery to power its electrical components and start the engine. This battery is located in the engine bay and is responsible for providing the initial burst of power needed to crank the engine and get the vehicle running.


Once the engine is running, the vehicle's alternator takes over, generating electricity to recharge the battery and power the various electrical systems, such as the lights, infotainment system, and other accessories. The battery serves as a backup power source, ensuring that the vehicle can still function even if the alternator fails or the engine is not running.


Maintaining the Battery in a Lexus RX 350



  • Regular battery checks and replacements: The battery in a Lexus RX 350 typically lasts between 3 to 5 years, depending on usage and environmental factors. It's important to have the battery tested periodically and replaced when necessary to ensure reliable performance.

  • Proper charging and maintenance: Ensuring the battery is properly charged and maintained can help extend its lifespan. This includes avoiding excessive drain on the battery, such as leaving lights or accessories on when the engine is not running.

  • Avoiding extreme temperatures: Extreme heat or cold can negatively impact the battery's performance and lifespan. Parking the vehicle in a garage or shaded area can help protect the battery from these environmental factors.


By understanding the voltage and proper maintenance of the battery in a Lexus RX 350, owners can help ensure their vehicle's electrical system remains reliable and efficient for years to come.

Is 14.7 volts too high on a battery?


A 14.7-volt reading is generally not too high for a 12-volt lead-acid battery while it's being charged, as it's within the typical range for a healthy alternator or charger, though it is at the upper end. However, if the voltage stays at or above 14.7 volts for a prolonged period after the battery is fully charged, or if readings are consistently above 15 volts, it could indicate overcharging and lead to damage. 
This video explains the ideal voltage range for a car battery: 1mOBD InsightsYouTube · Feb 13, 2025
What to know about 14.7-volt readings

  • While running: A reading of 14.7 volts is common and usually indicates the charging system is working correctly to keep the battery full while the engine is on. 
  • Maximum limit: Voltages above 15 volts are a strong indicator of overcharging. 
  • Monitor the voltage: If you see 14.7 volts, monitor the charging process to ensure the voltage drops to a lower, maintenance level once the battery is full. 
  • Potential for damage: Prolonged overcharging can cause the battery to lose water and shorten its lifespan. 

This video demonstrates what a charging voltage too high can look like: 56s1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · May 11, 2020
When to be concerned
  • If you consistently see a reading above 15 volts. 
  • If the voltage remains at 14.7 volts for a long time, even after the car has been running for a while. 
  • If you notice other symptoms of overcharging, such as a glowing check engine light or a rotten egg smell. 

If you are concerned about your battery's voltage, it is best to have a professional check the charging system for you.



How many volts is a Lexus battery?


A fully charged Lexus 12V battery should read approximately 12.6 volts when the engine is off. When the engine is running, the voltage should be higher, typically between 13.7 and 14.7 volts to indicate the charging system is working correctly. If the voltage is below 12.45 volts when the engine is off, the battery is not fully charged and may need to be recharged. 
This video explains how to check your Lexus battery and alternator voltage without tools: 1mViktor G AutomotiveYouTube · Aug 30, 2023
When the engine is off

  • Fully charged: Around 12.612.612.6 volts.
  • Partially discharged: Between 12.412.412.4 and 12.612.612.6 volts.
  • Discharged: Below 12.412.412.4 volts, which may require a recharge or replacement. 

When the engine is running
  • Charging: Between 13.713.713.7 and 14.714.714.7 volts. 
  • Stable voltage: The voltage should be in this range, with the alternator or generator assembly regulating the output. 

This video demonstrates how the 12V battery voltage changes in a Lexus NX: 59sLSFTYouTube · Apr 12, 2024
Other checks
  • During cranking: The voltage should not drop by more than about 2 volts. If it drops significantly or below 9.59.59.5 volts, the battery likely needs to be replaced. 
  • Hybrid battery: The high-voltage hybrid battery has a much higher operating voltage, around 280280280 volts for a Lexus RX450h. 

This video explains the voltage of a new high-voltage battery in a Lexus RX450h: 57sEV & Hybrid NetworkYouTube · Apr 10, 2025



How to check Lexus battery health?


Using onboard diagnostics, an OBD2 scan tool or voltage testing can help diagnose battery health before issues arise. If your Lexus hybrid and battery's performance is failing, consider professional service to determine if reconditioning, a refurbished battery pack or replacement is the way to go.



What type of battery does the Lexus RX350 use?


A Lexus RX350 typically uses a 12V lead-acid battery, most commonly in BCI Group Size 24F. However, some model years may also use other sizes, such as the 35, so it's best to confirm the correct fit for your specific year by using an online battery finder or checking the existing battery. The choice between different battery types, like traditional flooded or absorbed glass mat (AGM), depends on factors like climate and accessory power needs, with AGM generally offering premium performance, according to AutoZone.com and Interstate Batteries.
 
Key information

  • Common group size: 24F
  • Other possible group sizes: 35
  • Battery type: 12V lead-acid
  • Best practice: Use an online battery finder or check your current battery for the exact specifications for your vehicle's year and trim. 

Choosing a battery
  • Confirm the group size: Use an online tool or check your existing battery to ensure you buy the correct physical size (like 24F or 35) for your RX350. 
  • Consider battery type:
    • Flooded vs. AGM: Flooded batteries are standard, while Absorbed Glass Mat (AGM) batteries can offer better performance and are maintenance-free. 
    • Climate: AGM batteries are often recommended for those in more extreme climates. 
  • Check other specifications: Look at the Cold Cranking Amperage (CCA), Cranking Amperage, and Reserve Capacity to match your vehicle's needs. 
  • Check with your dealer: As Bell Lexus North Scottsdale notes, using a genuine Lexus battery is a great way to ensure the vehicle receives power according to manufacturer specifications. 


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.