Symptoms of a Bad or Failing Auxiliary Battery

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Cost of Replacing a Bad or Failing Auxiliary Battery

If you have multiple batteries in your vehicle, you may have to replace one if the vehicle won't crank, fluid is leaking, or the Battery Light is on. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Auxiliary Battery Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2009 Chrysler Sebring $179 $108.54 $70.00 17% $216.04
2003 Toyota 4Runner $184 $114.48 $70.00 16% $221.98
2006 Subaru Baja $171 $100.60 $70.00 18% $208.10
2004 Cadillac SRX $193 $122.84 $70.00 16% $230.34
2006 Mercedes-Benz C280 $241 $163.92 $77.00 14% $282.17
2014 Porsche Panamera $234 $163.92 $70.00 13% $271.42
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How to Diagnose a Bad or Failing Auxiliary Battery?

auxiliary battery

For most diesel engines, having two batteries is essential due to the number of components that need power. The main battery will run continuously, while the secondary auxiliary battery will get a trickle charge from the main battery. When the main battery is depleted, the auxiliary battery will kick in and continue to charge the car as needed. Just like the main battery, eventually the auxiliary battery will start to have issues and will need to be replaced.

Usually, these batteries will give you fair warning that they are in need of replacement. Taking notice and acting before the dead batteries leave you stranded on the side of the road is very important. Without properly working charging components, it will be nearly impossible for a vehicle to run like it is supposed to.

1. The vehicle won’t crank

Having a battery that is dead will result in you not being able to crank the car when needed. Usually, the car will run once it has been jumped off, but will quickly die back out after it is turned off. This is due to the fact that while it is running, the alternator of the vehicle is giving it the charging it needs. Once the alternator stops, the cells in the battery will not be able to hold a charge and will cut off.

2. Noticeable leaks around the battery

The fluid that is in the battery in your vehicle is very important because without it the cells of the battery will burn out. If you start to notice that this liquid is leaking out, then you will need to act fast to get the battery replaced. Getting this battery fluid on other parts of the engine can be very harmful due to the corrosion that it can cause.

3. The Battery Light is on

A fully charged battery will allow all of the components of a vehicle to function properly. Without a full charge, there will be a number of things that will not work or that will perform at a fraction at what they normally do. The Battery Light will usually come on when there is an issue with the charging system of a car. Getting both the battery and alternator checked will help you to narrow down where the problem lies.

Batteries

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Recent Auxiliary Battery Replacement reviews

Excellent Rating


YourMechanic Auxiliary Battery Replacement Service

Average Rating

5/5

Number of Reviews

26

Rating Summary
26
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Richard

18 years of experience
451 reviews
Richard
18 years of experience
Very good.
2014 MERCEDES-BENZ E350 - AUXILIARY BATTERY - ATLANTA, GEORGIA

Robert

28 years of experience
500 reviews
Robert
28 years of experience
Very quick and extremely knowledgeable, took the time to walk me through the planned repairs and why my ignition was failing. Up and running fot a 3rd of the cost a shop would start to charge me.
1998 SATURN SL1 - AUXILIARY BATTERY - SUNNYVALE, CALIFORNIA

Ben

38 years of experience
883 reviews
Ben
38 years of experience
Ben is a very knowledgeable professional mechanic. He was very helpful and provided excellant information about my car including future potential maintenance problems. Ben is big asset to Yourmechanic!
2003 MERCEDES-BENZ E320 - AUXILIARY BATTERY - HOUSTON, TEXAS

Chris

19 years of experience
1240 reviews
Chris
19 years of experience
Chris diagnosed and fixed my 2012 Land Rover Evoque quickly and cost effectively.
2012 LAND ROVER RANGE ROVER EVOQUE - AUXILIARY BATTERY - LAGUNA NIGUEL, CALIFORNIA

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