AGM, EFB or standard: which battery does a start-stop car need?
A start-stop car needs an EFB or AGM battery, not a standard one. Basic start-stop systems use EFB, while cars with energy recovery or lots of electronics use AGM. Always replace like with like or go up a level. Downgrading to save money usually means the battery fails early.
If your car switches its engine off at traffic lights, it has a start-stop system. These cars need a stronger battery than a standard car, and fitting the wrong type is one of the most common reasons a new battery fails early.
The three types in plain language
- Standard (flooded) battery. The normal battery most older cars use. Good value, but not built for constant restarts.
- EFB (Enhanced Flooded Battery). A tougher version of the standard battery, made for basic start-stop systems.
- AGM (Absorbent Glass Mat). The strongest of the three. Used in cars with advanced start-stop, energy recovery under braking, or lots of electronics.
Don't downgrade
Always replace like with like, or go up a level. If your car came with an AGM battery, fitting an EFB or standard battery to save money usually means it fails within months, and start-stop may stop working.
Why fitment includes a reset
Many newer cars, especially European ones, need to be told that a new battery has been fitted, so the car charges it correctly. Without this reset, the car can overcharge or undercharge the new battery. Ask us whether your car needs this when you get your price. Complex fitments that take longer than about 20 minutes may carry a labour charge, and we'll always tell you upfront.
Not sure what your car has?
WhatsApp us your car's make, model and year, and we'll tell you which battery it needs and the price at each level. AGM batteries carry up to a 3-year warranty.
Questions about your battery?
WhatsApp us your vehicle and we'll help. No appointment needed for a free test.
Related: Free battery test · Car won't start? · FAQ