A car battery costs $79-$160 flooded, $130-$230 EFB, and $180-$320 AGM, with installed totals of $100-$400 for most cars — and in a twist most people miss, often $0 extra for installation, because the big parts chains bolt it in free with purchase. Here's the whole bill: chemistry, labor routes, the refundable core charge, and what a battery actually costs per year of service.
| Type | Part | Installed | Typical life | Spec'd for |
|---|---|---|---|---|
| Flooded (standard) | $79 – $160 | $100 – $200 | 3-5 years | Cars without start-stop |
| EFB | $130 – $230 | $150 – $275 | 4-6 years | Basic start-stop systems |
| AGM | $180 – $320 | $200 – $400 | 5-7 years | Heavy start-stop, big electronics |
The label on your old battery settles this: if it says EFB or AGM, that's the spec (AGM counts as an upgrade over EFB; a plain flooded battery does not). If your car restarts its engine at stoplights and you install a $99 flooded battery to save money, the deep cycling of the restarts will eat it in months — a false economy that costs more per month of service than the battery you were supposed to buy. AGM also charges at different voltages, so even the alternator cares.
AutoZone, O'Reilly, Advance, and most Walmart locations install standard underhood batteries free with purchase, which collapses the "installed" line to zero. The catches are real but narrow: they won't work on cars where the battery lives under a seat or in the trunk (some BMW, Mercedes, and Dodge models), they don't do battery registration on European cars, and the vehicle has to be at the store since nobody tows a dead car to a free install.
When those catches bite, the ladder is: independent shop at $30-$80 labor, dealer at $60-$150 plus a $30-$100 registration fee on European start-stop vehicles. Dealer AGM replacements have been quoted past $600 on premium cars — which sounds outrageous until you decompose it into a $300 battery, $100+ labor, coding, and dealership overhead, and then ask an independent to do the same job for $250-$350.
Pick chemistry, route, and whether your European car needs registration — the calculator shows out-the-door cost and cost per year of service.
Car Battery Replacement Cost Calculator →A core charge is a $10-$25 deposit added when you buy a battery without trading in the old one. It's not a fee — it's collateral. Dead batteries are nearly 100% recyclable into new ones, so the deposit exists to pull old cores back through the system. Bring the old battery with you and the charge never appears; return it within the store's window (usually 30-90 days, longer in states with battery deposit laws) and the money comes back. Retailers are required to accept cores for return even months later in most states, so there's rarely a reason to leave it behind.
The sticker price lies a little: what you care about is cost per year of service. A $79-$160 flooded battery lasting 3-5 years runs $16-$53 a year. An EFB at $130-$230 over 4-6 years runs $22-$58. An AGM at $180-$320 over 5-7 years runs $26-$64. Notice the bands overlap heavily: AGM's premium mostly buys start-stop capability and deep-cycle tolerance, not a dramatically cheaper year of service. Heat is the other variable — in Phoenix or San Antonio, trim a year or more off every one of those lifespans.
For context inside the maintenance budget, a battery is roughly the same order of magnitude as the year's oil changes: the oil change calculator prices those per mile, and the 30/60/90K maintenance calculator places both inside the $380-$800 a year a mainstream car typically consumes.
And if your "battery problem" is a hybrid that won't start, that's a different battery entirely — the hybrid battery replacement calculator prices new versus remanufactured versus used packs, which run into four figures rather than three.
A flooded battery runs $109-$240 installed at an independent shop ($79-$160 for the part), EFB $160-$310, and AGM $210-$400. Most parts stores install free with purchase, so the installed price and the battery price are often the same number. Dealer installs run $270-$570 on AGM cars because of $60-$150 labor plus battery registration on European vehicles.
If the car came with AGM, it is not a choice: start-stop systems deep-cycle the battery on every restart and a flooded battery fails in months. If your car didn't come with AGM, the premium buys little. Per year of service, flooded at $79-$160 costs $16-$53 and AGM at $180-$320 costs $26-$64, so the extra money mostly buys capability, not longevity.
You simply lose the $10-$25 deposit. The core charge exists because dead batteries are recycled into new ones; stores must accept the old core for return even months later in most states, so there's rarely a reason to leave money on the table.