It uses a standard 12-volt automotive battery (flooded lead-acid).
In practice, the exact group size and CCA rating can vary by trim and climate, but most 2018 Altimas use a conventional 12V battery with a replacement group size around 35 or 24F and a CCA rating typically in the 520–700 range. Always verify the battery label or owner's manual for the precise specification.
Battery type and specifications
The Altima’s electrical system relies on a traditional 12-volt battery to start the engine and supply accessories. For models sold in 2018, the battery is typically a conventional flooded lead-acid unit rather than an AGM pack, unless you have a very specific option such as a start-stop system. The exact group size and CCA depend on trim and climate.
Common group sizes and ratings
When shopping for a replacement, you’ll usually encounter a couple of standard group sizes that fit the 2018 Altima. Here are the most common options and what they mean.
- Group Size 35: A standard 12-volt flooded lead-acid battery used by many mid-size sedans; typical CCA around 540–720, depending on the brand and climate.
- Group Size 24F: A similar 12-volt flooded battery with a slightly different terminal arrangement; commonly offers comparable CCA ratings to group 35.
- AGM option (rare for base 2018 Altima): If your car is equipped with feature(s) like start-stop or a specific trim/package, an AGM battery may be recommended for higher resilience and recharge efficiency.
Note: The exact size and rating can vary by vehicle configuration. Always check the current battery label or the owner's manual for the OEM specification.
How to identify the right battery for your car
To ensure you install the correct battery, use these steps to verify before purchasing.
- Check the owner's manual or the current battery label for the exact group size and CCA rating.
- Look at the battery’s top label to confirm Group Size, CCA, and terminal layout (positive/negative terminals and whether they’re side- or top-mounted).
- Choose a replacement that matches or exceeds the OEM CCA and reserve capacity, and ensure it fits the engine bay and terminal orientation.
- Consider using an OEM replacement or a reputable aftermarket battery with equivalent specifications; avoid undersized replacements.
- If your Altima has start-stop or you live in very cold climates, an AGM battery may be advisable, but verify compatibility with your model year and trim.
When in doubt, consult a Nissan dealer or an experienced automotive parts retailer to confirm the exact group size and CCA for your vehicle.
Summary
The 2018 Nissan Altima uses a standard 12-volt flooded lead-acid car battery. Replacement batteries are typically Group Size 35 or 24F with CCA in the range of roughly 520–700, depending on climate and trim. Always verify the OEM specification on the existing battery label or in the owner's manual, and consider an AGM battery only if your model requires or benefits from it (e.g., start-stop systems or very cold climates).