Most cars on the road use one of two kinds of 12-volt battery: a standard flooded battery or an absorbent glass mat (AGM) battery. They look similar and come in the same group sizes, but they are built differently and they are not always interchangeable.
How they differ
| Standard flooded | AGM | |
|---|---|---|
| Electrolyte | Liquid acid around the plates | Held in glass-fiber mats |
| Spill-proof | No, must stay upright | Yes, sealed |
| Deep cycling and start-stop | Wears out quickly | Designed for it |
| Vibration resistance | Good | Better |
| Price (Duralast, battery only) | From about $179.99 | From about $259.99 |
| Listed warranty (Duralast) | 2 years | 4 years (Platinum AGM) |
Vehicles that need AGM
If your vehicle came from the factory with an AGM battery, it needs AGM again. That includes nearly every vehicle with automatic start-stop and many late-model European cars, trucks and SUVs. These vehicles charge the battery differently and cycle it hard every time the engine shuts off at a light. A flooded battery in that role often fails early and can trigger warning lights.
Can I go from standard to AGM?
Usually yes, as long as the group size and terminals match. An AGM upgrade can make sense if you make a lot of short trips, the vehicle sits for long periods, you run accessories like a dash cam or light bar, or you simply want the longer listed warranty.
Can I go from AGM to standard?
We do not recommend it. Saving money on the battery now often means buying another one much sooner.
Duralast options
Browse Duralast standard batteries and Duralast Platinum AGM batteries, or let the battery finder suggest the right one. We confirm the choice against your VIN before dispatch.