Yes, Mercedes-Benz warranty coverage does include the battery, but the terms depend entirely on which battery you mean. The factory 12-volt battery is covered for 4 years or 50,000 miles. High-voltage batteries in electric models run 8 or 10 years depending on the vehicle. Plug-in hybrid batteries get 6 years or 62,000 miles, with a much longer term in California and states that follow its rules. The paid extended warranty, on the other hand, covers no battery at all. Here is how each piece fits together.
12-Volt Battery Coverage
The 12-volt battery installed at the factory in a new Mercedes is covered for 48 months or 50,000 miles, whichever comes first, against defects in material and workmanship under normal use.1MBUSA. Mercedes-Benz Vehicle Service Parts and Accessories Limited Warranty That matches the basic new-vehicle limited warranty, which also runs four years or 50,000 miles.2MBUSA. Mercedes-Benz New Vehicle Limited Warranty If the factory battery fails inside that window because of a defect, an authorized dealer replaces it with no charge for parts or labor. There is no proration, and the terms apply to both AGM and standard wet-cell batteries.
Once the factory battery dies out of warranty, any replacement bought from an authorized Mercedes-Benz dealer on or after August 1, 2000, carries its own warranty: 24 months from the date of purchase with unlimited mileage.1MBUSA. Mercedes-Benz Vehicle Service Parts and Accessories Limited Warranty Parts and labor at an authorized dealer are covered at no charge.3MB Laguna. Are Mercedes-Benz Parts Covered Under Warranty To make a claim on a replacement, you need to hand over the defective battery and produce either the original sales receipt or a repair order showing the purchase date. The dealer is entitled to a reasonable amount of time to test both the battery and the vehicle’s charging system before approving anything.
Key-Fob Battery
The tiny battery in the key fob is treated differently. A replacement key-fob battery bought from a dealer is warranted for 90 days from the purchase date, and you need to keep the sales receipt or repair order to prove when you got it.1MBUSA. Mercedes-Benz Vehicle Service Parts and Accessories Limited Warranty The new-vehicle warranty itself lists remote-control key batteries as a consumable wear item, so they are not covered under the basic four-year warranty.2MBUSA. Mercedes-Benz New Vehicle Limited Warranty
EV High-Voltage Battery Coverage
The traction battery in a Mercedes-EQ electric vehicle has its own separate warranty, much longer than the standard vehicle coverage. The length depends on the model:
- EQB: 8 years or 100,000 miles, whichever comes first.4MBUSA. Mercedes-EQ Warranty and Service Booklet
- EQE, EQE SUV, EQS, and EQS SUV: 10 years or 155,000 miles.
- 2027 CLA-Class EV: 8 years or 100,000 miles.5Car and Driver. Mercedes-Benz CLA-Class EV
The warranty covers more than outright failure. Mercedes also guarantees a minimum capacity, measured in amp-hours, for the length of the coverage period. If your battery degrades below the threshold for your model, Mercedes will repair or replace it. The thresholds are 133 Ah or 160 Ah for the EQB depending on battery configuration, 204 Ah for the EQE and EQE SUV, 192 Ah for the EQS, and 197 Ah for the EQS SUV.4MBUSA. Mercedes-EQ Warranty and Service Booklet Worth knowing: a repaired or replaced battery does not have to come back at full original capacity. Mercedes can use reconditioned or remanufactured parts as long as the battery meets at least the minimum capacity listed for that model.
Plug-In Hybrid Battery Coverage
Plug-in hybrid Mercedes models fall between the 12-volt and full EV terms. The high-voltage battery in a PHEV is covered for 6 years or 62,000 miles, whichever comes first.2MBUSA. Mercedes-Benz New Vehicle Limited Warranty Coverage runs to the original buyer and every later owner, and it protects against defects in material or workmanship.6Elite Mercedes. Mercedes-Benz Warranty
Longer Coverage in California and CARB States
If you own a SULEV-rated plug-in hybrid registered in a state that follows California Air Resources Board standards, the high-voltage battery warranty stretches to 10 years or 150,000 miles.2MBUSA. Mercedes-Benz New Vehicle Limited Warranty As of the 2026 model year, that list of states includes California, Colorado, Connecticut, Massachusetts, Maryland, Maine, Minnesota, New Jersey, Nevada, New York, Oregon, Rhode Island, Virginia, Vermont, and Washington.7MBUSA. Mercedes-Benz Warranty Booklet California rules effective for the 2026 model year also require any manufacturer to warrant that EV and PHEV batteries hold at least 70 percent state of health for 8 years or 100,000 miles, rising to 75 percent for 2031 and later model years.8California Code of Regulations. 13 CCR 1962.8
What Voids Battery Coverage
A battery warranty claim can be denied when the failure traces back to how the battery was used rather than how it was built. For the 12-volt battery, exclusions include a simply discharged battery that only needs recharging, physical damage such as broken containers or terminals, neglect, misuse, accidents, fire, improper installation, jump-starting errors, reverse-polarity charging, freezing, use of a battery with an amp-hour rating smaller than Mercedes specifies, transferring a replacement battery from one vehicle to another, failures caused by non-genuine service parts, and skipped owner maintenance such as checking electrolyte levels.1MBUSA. Mercedes-Benz Vehicle Service Parts and Accessories Limited Warranty
The high-voltage battery in an EV carries its own set of voiders. Coverage is lost if the vehicle sat for more than 14 days at a zero-percent charge, if the battery was exposed to direct flame, immersed in water, physically damaged, opened, or serviced by anyone other than an authorized dealer, or if incompatible charging equipment or unapproved charging procedures were used.4MBUSA. Mercedes-EQ Warranty and Service Booklet PHEV battery exclusions follow the same pattern.
The Extended Warranty Does Not Cover Batteries
This one surprises a lot of owners. The Mercedes-Benz Extended Limited Warranty, which you can buy in one-, two-, or three-year increments to continue coverage past the factory warranty, specifically excludes vehicle batteries.9MBUSA. Mercedes-Benz Extended Limited Warranty Batteries sit on the same exclusion list as tires, shock absorbers, glass, and paint.10MBUSA. Extended Limited Warranty Roadside assistance under the extended plan will still give you a jump if the battery dies, but replacing the battery itself is out of pocket once the original coverage expires.
Filing a Claim
Every battery warranty claim goes through an authorized Mercedes-Benz dealer, and the process is broadly the same for 12-volt, PHEV, and EV batteries. Bring the vehicle in during service hours, allow time for diagnosis, and expect the dealer to check whether the vehicle has been maintained on schedule. Receipted invoices, repair orders, or a signed maintenance booklet all work as proof of service.2MBUSA. Mercedes-Benz New Vehicle Limited Warranty For a 12-volt claim, the dealer tests the battery and the charging system. For a high-voltage battery, Mercedes reserves sole discretion over the method used to measure capacity.11MBUSA. Mercedes-EQ Warranty and Service Booklet If the battery qualifies, repair or replacement is at no charge. If testing shows no defect, the claim is denied.
Battery warranties transfer with the vehicle. The new-vehicle limited warranty and the emission systems warranty both cover the original and each subsequent owner, and the time and mileage limits keep running from the original in-service date.2MBUSA. Mercedes-Benz New Vehicle Limited Warranty Hang on to every repair order and pass them along if you sell the car.