Walmart Group 78 Battery: What to Check Before You Buy
The Short Answer
Walmart generally sells group 78 batteries under its EverStart house brand, often in both a conventional flooded version and an AGM (absorbed glass mat) version. Whether one suits your vehicle depends on three things: your vehicle actually calls for group 78, the battery meets or exceeds the cold-cranking rating your manufacturer specifies, and the battery type matches what your vehicle was built with. Stock, current prices and warranty terms vary by store and change over time, so confirm them for your local store before you go.
What Group 78 Means
A battery group size is an industry standard from the Battery Council International (BCI). It defines the case dimensions, terminal type and terminal position, so a battery fits the tray, hold-down and cable layout. It does not define power output. Two group 78 batteries can have very different electrical ratings.
Group 78 batteries use side-post terminals: the connections are bolted into the side of the case rather than sitting on top. This layout is common in many General Motors vehicles and appears in some other makes. A top-post battery of a similar size will not connect to side-terminal cables without modification, so the terminal style matters as much as the case size.
Confirm Your Vehicle Needs Group 78
Battery fitment can change across model years, engines and trims of the same model. Optional equipment such as heavy-duty electrical packages, towing packages or start-stop systems can also change it. Do not assume a group 78 is correct because it fit a similar vehicle. Check one or more of these sources:
The label on your current battery, if it is the original type or a correct replacement; Your owner's manual or the manufacturer's parts information for your exact model year, engine and trim; Walmart's in-store or online battery lookup, entering your exact year, make, model and engine; A dealer parts department, if lookup results conflict or your vehicle has unusual equipment
If these sources disagree, go with the manufacturer's specification. Some vehicles list more than one acceptable group size, often a side-terminal and a dual-terminal option, so a different group number in a lookup is not necessarily an error.
Ratings to Compare
Rating | What it tells you | How to use it; Cold cranking amps (CCA) | How much current the battery can deliver to start the engine in freezing conditions | Meet or exceed your vehicle's specified minimum; higher matters most in cold climates; Reserve capacity (RC) | How long, in minutes, the battery can run essential electrical loads if the charging system fails | Higher is useful for vehicles with heavy electrical demand or frequent short trips; Battery type (flooded or AGM) | Internal construction, which affects charging needs and tolerance of deep discharge | Match the original type, especially on vehicles designed for AGM; Date code | When the battery was made | Prefer a recently manufactured battery; ask staff how to read the code if it is unclear
Flooded or AGM?
A flooded battery uses liquid electrolyte and is the traditional, usually less expensive choice. An AGM battery holds its electrolyte in glass-fiber mats. It is sealed, handles vibration and repeated deep discharges better, and is often specified for vehicles with start-stop systems or high electrical loads. AGM typically costs more.
If your vehicle came with an AGM battery, replace it with AGM. Its charging system may be calibrated for that chemistry, and a flooded battery may wear out faster. Some vehicles also need a battery registration or reset step after replacement. If your vehicle originally used a flooded battery, an AGM upgrade is usually acceptable but not required. Check your owner's manual if you are unsure.
Buying and Installing at Walmart
Walmart typically adds a core charge to a new battery. The charge is refunded when you return your old battery, either at purchase or within the store's return window. Many Walmart locations with an Auto Care Center can test your current battery and install the replacement, but services and hours vary by location. Call ahead if you need installation.
Read the warranty terms on the specific battery before buying. Free-replacement periods differ between battery lines and can change. Keep your receipt, because it is usually needed for warranty claims.
What This Guide Cannot Confirm
No current pricing, stock levels, specific EverStart model ratings or warranty lengths were available for this guide, so none are stated here. Check these details for your local store before you buy, along with your vehicle's exact fitment for its model year, engine and trim.