The 2014 Lexus IS250 uses a standard 12-volt automotive battery. The most common replacement size is Group Size 35, though some markets may use Group 24F. Always verify by checking the current battery label or the owner's manual.
Battery basics for the IS250
The IS250 relies on a conventional 12-volt lead-acid battery to start the engine and power electrical systems when the engine is off. This is standard for most non-hybrid vehicles, with replacement life typically ranging from about 3 to 5 years depending on climate and driving habits.
Common replacement sizes
When shopping for a replacement, knowing the typical sizes used by this model helps ensure a proper fit and performance.
- Group Size 35: The most common replacement size for 2014 IS250 models in North America. Expect a 12-volt battery with roughly 540–600 cold-cranking amps (CCA) and adequate reserve capacity.
- Group Size 24F: Used in some markets or production runs. Also a 12-volt lead-acid battery, but you should verify exact fit for your vehicle.
- AGM option: Some aftermarket or dealer-supplied batteries for this model may be AGM (absorbed glass mat), offering longer life and better performance in certain conditions. Confirm compatibility with your vehicle’s charging system before purchasing.
Bottom line: Always confirm the exact group size and CCA rating by checking your current battery’s label or consulting the owner's manual. If you shop with a parts counter, provide your VIN to ensure the correct fit.
How to identify the correct battery for your IS250
Use these checks to confirm you buy the right battery for your car and region.
- Inspect the current battery label for the Group Size (e.g., 35 or 24F) and CCA rating.
- Consult the owner's manual or Lexus/TOYOTA parts catalog for the OEM group size and spec.
- If purchasing through a dealer or parts retailer, provide the VIN to ensure the correct fit and battery type.
With the correct group size confirmed, you can confidently purchase the right replacement or have a professional install it.
Replacement tips and care
Before you replace the battery, gather the right tools and follow safety precautions to protect yourself and the vehicle’s electronics.
Tools and supplies
Before you begin, assemble these common tools and supplies.
- Safety glasses and gloves
- Socket set or wrenches to remove the hold-down and terminals
- Wire brush or terminal cleaner
- Battery terminal protectant or corrosion-safe spray
- New battery in the correct Group Size
With tools on hand, you’re ready to proceed or choose to have a professional handle the replacement if you’re unsure.
Step-by-step replacement
- Park on a level surface, set the parking brake, and turn off the ignition. Open the hood and locate the battery.
- Disconnect the negative (black) terminal first to minimize the risk of shorting the battery to the chassis.
- Disconnect the positive (red) terminal.
- Remove the hold-down clamp or bracket securing the battery in place.
- Carefully lift the old battery out of the tray and inspect the tray for corrosion; clean as needed.
- Install the new battery in the tray, ensuring the terminals face the same directions as the old battery.
- Reconnect the positive terminal first, then the negative terminal. Tighten to the manufacturer’s specified torque and ensure a solid connection.
- Reinstall the hold-down bracket and any covers. Close the hood and start the engine to confirm proper operation.
If you’re not comfortable performing a battery swap, a quick visit to a Lexus service center or reputable auto shop can complete the replacement safely and correctly.
Summary
The 2014 Lexus IS250 uses a standard 12-volt automotive battery, with Group Size 35 being the most common replacement size in many regions (some markets may use 24F). Always verify the exact size and CCA by checking the current battery label or the owner's manual, and consider AGM options if you want longer life or better cold-weather performance. When replacing, follow proper safety steps or rely on a professional to ensure a correct and secure installation.