Auxiliary Battery Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings


Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings


How much does Auxiliary Battery Replacement cost?

It depends on the type of car you drive and the auto repair shop you go to. Our mechanics are mobile, which means they don't have the overhead that repair shops have. They provide you convenience by coming to your home or office.

Auxiliary Battery Replacement pricing for various cars

CarsEstimateParts CostLabor CostSavingsAverage Dealer Price
2016 Honda HR-V$276$181.10$94.994%$288.60
2014 Chevrolet Sonic$317$222.28$94.993%$329.78
2016 Nissan Sentra$258$162.74$94.994%$270.24
2006 Lexus SC430$275$179.84$94.994%$287.34
2013 Infiniti M37$274$178.56$94.994%$286.06
2014 Ford Mustang$284$189.12$94.994%$296.62

Auxiliary Battery Replacement Service

What is the Auxiliary Battery all about?

The vast majority of passenger vehicles on the road today have only a single, large battery. It’s generally located under the hood, although some makes and models have the primary battery in the trunk, near the spare tire. This battery’s job is simple – it provides the electricity needed to start the engine. All other power generated during operation to power the radio, signal lights, and other accessories comes from the alternator.

However, some vehicles (notably higher-end European imports) have more than one battery. There’s the primary battery under the hood, but there’s also an auxiliary battery. These are used to power other systems on the car that require 12 volts of power, and which the alternator is not capable of powering directly. In these instances, the alternator is responsible for charging both the primary and the auxiliary battery. The primary battery delivers voltage during cranking, and the auxiliary battery runs some or most of the car’s accessories.

Like all batteries, auxiliary batteries will eventually wear out or fail. When this happens, they’ll need to be replaced.

Keep in mind:

  • Auxiliary batteries can be checked during maintenance, but it’s necessary to work with a mechanic familiar with the setup of your vehicle.
  • Auxiliary battery failure generally does not prevent you from driving, but it will create complications such as accessory functions not working.
  • Battery size, location, and cost vary drastically from one vehicle to another.

How it's done:

  • The Auxiliary battery is verified that it needs to be replaced. Accessories are removed as needed for access.
  • The defective Auxiliary battery is disconnected and removed.
  • The battery connections are cleaned and the new Auxiliary battery is installed, secured, and connected.
  • Any accessories that were removed for access are reinstalled. The Auxiliary battery is tested for operation.
  • The vehicle is tested to ensure proper operation of the Auxiliary battery.

Our recommendation:

Over time and through normal use, your battery deteriorates. Eventually, it will fail completely. Most have a lifespan of about five to seven years, but this is only an estimate. Once your auxiliary battery fails, it puts a strain on the rest of your system, and some of your accessories may not operate properly or at all. Have the problem professionally diagnosed by one of our expert mechanics as electrical issues can stem from many different problems, not just battery failure.

What common symptoms indicate you may need to replace the Auxiliary Battery?

  • AUX Battery light on in the dash
  • Some or all accessories not working properly

How important is this service?

While a failed auxiliary battery will not prevent your vehicle from driving, it can cause significant complications, including important accessories malfunctioning or not working at all. It can also put additional strain on the rest of your charging system components. Have the auxiliary battery replaced as soon as possible.

Recent Auxiliary Battery Replacement reviews

Excellent Rating


Rating Summary


5 years of experience
42 reviews
5 years of experience
Chrysler 200 V6-3.6L - Battery - Phoenix, Arizona
Ryan was very prompt to tell me he was running late to apt because of waiting for a battery at shop.


20 years of experience
644 reviews
20 years of experience
Ford Escape L4-2.0L Turbo - Battery - West Jordan, Utah
Joe arrived on time, explained everything thoroughly and got my car running quickly. He did a great job and was done promptly.


22 years of experience
2229 reviews
22 years of experience
Cadillac DTS V8-4.6L - Battery - Santa Ana, California
Service was exactly as hoped - Chris was at my house on the day and time set and completed the work quickly and efficiently.


17 years of experience
224 reviews
17 years of experience
Infiniti G35 V6-3.5L - Car Battery Replacement - Pflugerville, Texas
Friendly and professional. Made it extremely efficient and made my day have less worry getting the car fixed.

Recent articles & questions

How to Buy Good Quality Mud/Splash Guards
For For trucks and SUVs that actually get off the pavement, mud and water can be threats. When driving through puddles, on dirt roads, or in off-road environments, water, mud, sand and other debris can splash up from the wheels....
How to Replace an Electronic Brake Control Module (EBCM)
ABS systems is controlled by electronic brake control modules (EBCM) which monitors sensors and relays data for smooth and safe braking.
B1996 OBD-II Trouble Code: Passenger Side Side-Mount Air Bag Circuit Short to Vbatt
B1996 trouble code means there's a problem with the passenger side side-mount air bag circuit, caused by faulty wiring or connectors or the air bag.

Windshield washer fluid is not spraying

This could very well be the issue. A few other things that should be check before condemning the pump itself are the fuse to the pump, the switch that activates the pump and the hose that goes to your windshield...

Car feels sluggish

Hi there: Once your vehicle starts, the job of the battery is pretty much complete. The alternator is what powers vehicle systems while the engine is running; which is possibly what's causing the battery to drain, and the engine to...

Problems after transmission put in

Check to see if there is warranty coverage on the work that was performed. It is not clear if the issue is the engine jerking or the transmission jerking, or both. The noise, of course, is a clear indication of...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

+1 (855) 347-2779 ·