How Long Does an Auxiliary Battery Last?

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When a dual battery system is added to a vehicle, it is usually because accessories have been added to the vehicle that are not factory-standard, and the primary battery in the vehicle does not deliver sufficient power to drive these new accessories effectively. Understand that we’re not saying you need an auxiliary battery to power, say, a phone charger or a stand-alone GPS. It’s more like if you’ve converted a cargo van into a camper, and you’ve added a fridge, microwave, entertainment system… you get the idea. In that case, it can be highly advantageous to have one battery to deal with starting your vehicle, and another to operate your accessories. That way, once you’ve reached your campsite, you don’t have to worry about drawing power from your primary battery.

So, how long will your auxiliary battery last? Properly cared for and maintained, you can expect anywhere from 18 months to 3 years of life from an auxiliary 12-volt battery. Much will depend on frequency of use, and how well the battery is protected. Rough roads can cause the cells to break down, reducing the lifespan. Allowing it to drain to less than half of its rated capacity will also reduce the life of the battery. And of course, if you are parking your vehicle for any length of time, you should use a battery maintainer.

Signs that your auxiliary battery needs to be replaced include:

  • Accessories not operating properly
  • Accessories not working at all

If you think your auxiliary battery could be failing, have it checked. A professional mechanic can test your auxiliary battery, and replace it if necessary.


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Theodore

14 years of experience
1091 reviews
Theodore
14 years of experience
Dodge Grand Caravan - Brake Pads Replacement (Front) - Bellevue, Washington
Second time using Theodore to service my van. He's always professional and detail oriented. He takes extra effort in tracking down issues and explains things well. Very customer oriented. Highly recommend.

Tung

14 years of experience
284 reviews
Tung
14 years of experience
Ram 1500 - Brake Pads Replacement (Front) - Marietta, Georgia
Tung showed up on time and was very friendly. Changed my brake pads in about 30 minutes and gave me recommendations on when to change the rear pads. Will ask for him by name next time.

Victor

33 years of experience
105 reviews
Victor
33 years of experience
Chrysler Grand Voyager - Brake Pads Replacement (Front) - Albuquerque, New Mexico
Have used Victor multiple times now for work on my vehicle. He is prompt, courteous, knowledgeable, and dependable. I never have to worry about a thing as Victor makes sure work is performed quickly, efficiently and and correctly.

Chuck

8 years of experience
120 reviews
Chuck
8 years of experience
Honda Odyssey - Brake Pads Replacement (Front) - Coppell, Texas
Had an appointment for replacing Front Brake Pads today. Chuck did a great job and completed the task before the schedule. I will surely refer yourmechanic to my friends as well. Happy Thanksgiving Chuck. Thanks again for your great service.

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