The 2007 Lexus IS 250 uses a standard 12-volt automotive battery. In most markets, replacement batteries for this model are commonly Group 35, though the exact size can vary by region and trim; always verify by checking the label on your current battery or the owner's manual.
The IS 250 from that year is not a hybrid, so its battery setup relies on a conventional 12-volt system that powers starting, lighting, and electronics. Battery size and terminal configuration are determined by the vehicle’s electrical load and space constraints, which means there can be regional variations. For accuracy, confirm the correct size with the vehicle’s manual, a Lexus dealer, or an auto parts retailer using your VIN.
Battery type and size basics
The following information covers the most common options you’ll encounter when replacing the battery on a 2007 IS 250. It is intended to help you prepare for a replacement and to understand what to check.
- Group size most often used: 35 (common in many regions for this model).
- Alternatives you might encounter: Group 24F or Group 24R in some markets.
- Battery type: 12-volt sealed lead-acid, typically maintenance-free.
Which group size fits your car is determined by the exact build and the market. Using a battery that is too large or with incompatible terminals can lead to fitment or electrical issues. Always cross-check the current battery’s group size printed on the label or in the service manual before purchasing a replacement.
What to look for when replacing
When selecting a replacement, consider these specifications to ensure reliable starts and proper electrical performance in your climate and driving habits.
- Voltage: 12 volts (nominal).
- Cold-cranking amps (CCA): aim for a replacement with equal or higher CCA than the original to ensure reliable starting in cold weather.
- Reserve capacity (RC): higher RC can help with long drives and accessory usage without the engine running.
- Maintenance: most IS 250 replacements are maintenance-free sealed batteries; verify venting and terminals.
- Physical fit: match the group size, terminal layout, and terminal polarity to ensure proper cable fit and clearance.
When in doubt, have the battery professionally tested. A misfit or a battery with insufficient CCA/RC can cause starting problems or electrical issues, especially in extreme temperatures.
Installation tips
If you’re replacing the battery yourself, follow these practical steps to do it safely and correctly:
- Disconnect the negative (-) terminal first, then the positive (+) terminal.
- Remove the old battery and clean the tray and clamps before installing the new one.
- Install the new battery with the positive terminal on first, then reconnect the negative terminal.
- Secure the battery firmly in the tray and ensure all cables are reattached snugly.
Following the manufacturer’s torque specifications and disposing of the old battery at an appropriate recycling facility are important steps in any replacement.
Additional considerations by market
Vehicle electronics and regional supply chains can influence exact requirements. Some markets may specify different group sizes or battery brands based on climate or dealership recommendations. If your IS 250 has optional equipment that alters electrical load, or if you live in extreme heat or cold, you might prefer a battery with higher CCA or RC than the stock specification.
Summary
The 2007 Lexus IS 250 generally uses a 12-volt, maintenance-free lead-acid battery, with Group 35 being the most common replacement size in many regions. Always verify the exact group size and specifications from the battery label, the owner’s manual, or a Lexus dealership or trusted auto parts retailer using your VIN. When replacing, consider CCA, RC, and fitment to ensure reliable starts and sustained electrical performance across seasons.