Q: Auxiliary battery draining the hybrid battery

asked by on June 28, 2016

The battery level has been changing color from blue to purple/lavender. The dealer told me this is because the auxiliary battery was not properly installed. For the past 3 or 4 weeks after the installation, my car has been sounding like a racing car. He also told me that it was the auxiliary battery that had drained the hybrid battery. The dealer had initially reported to me that the auxiliary battery had been charged and reinstalled. However, this morning I had to go back to the dealership for the very same problem. The battery was again turning from blue to purple/lavender and it still sounded like a racing car when I would drive it. If they hadn't installed the auxiliary battery properly, would it be taking this long for me to notice the problem that I'm now having?

Service Battery/cables $79.99 - $89.99 Get a Quote

Auxiliary batteries can take awhile before symptoms may be noticed on a Prius. This is due to the hybrid system powering many of the components. In this vehicle the auxiliary battery is mainly used for starting. It could cause problems if not installed properly.

I’d recommend getting some help from qualified technician who will be able to diagnose the source of your battery issue and assist you with any repairs that may be necessary.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

I have a Honda Accord 2006 . I hear a noise when I turn the wheel n than notice when I open the hood that there was power steering

Hello, thank you for writing in. The low fluid levels are why you are hearing noises and having issues turning (or will be soon). While you can already see there is a leak, we need to find out what exactly...

No Codes, however, the car is jerking when WOT

Hello and thank you for contacting Your Mechanic. With the symptom of the engine being jerky and the engine computer system is not picking up anything, then you have a problem with the engine mounts. If the engine mounts are...

Warning light on

Hi, the Check Engine Light turns on when the car's computer detects a fault somewhere. While you are driving the car, the computer is constantly checking all of the signals coming from the sensors throughout the vehicle. The computer knows...

Car steering wobble at speed of 40 kmph

Hello - there are a couple of possibilities for this behavior, all of them a safety concern. A tire with separating tread can behave in this fashion - an air bubble can form inside the tire which causes low speed...

Car won't start after being parked

When the key is turned and nothing happens could mean several things; you have a bad battery (most common), the switch is bad, or the starter is not working. If you hear a click when you turn the key and...

The vehicle makes a humming/whining sound immediately after highway driving. After several minutes off highway, noise stops.

Hello, thank you for writing in. There are several issues that may cause these issues. You will want to start by making sure the brakes are not sticking. This can be done by raising the vehicle and checking for grinding...

Dash lights came on and gauges dropped to zero

Hello there, thanks for writing in about your 2006 Chevrolet Trailblazer EXT. First, I would suspect a faulty ignition switch, and would put that near the top of my diagnostic checklist. I also recommend a thorough visual inspection, testing of...

I accidentally put diesel in my gasoline engine car drove it for about 2 mins then car stopped what do i do after this

The best thing to do would be to have the fuel drained out of the tank by a qualified professional. Once the fuel is drained out of the tank by a qualified professional, you can bend refill the tank with...

Hard to shift gears in traffic jam

The clutch and transmission on your vehicle are fairly straightforward systems. If virtually all of it has been replaced and yet it still doesn't work, that is frankly a guarantee that the cause of the problem is faulty, inept, careless...

Related articles

Symptoms of Bad or Failing Battery Terminal Ends
If you experience problems starting and powering the car or find corrosion on the battery terminals, you may need to replace the terminal ends.
Symptoms of a Bad or Failing Alternator
Common signs include having to jump start the car frequently, dim lights when operating the vehicle, or the Battery Light coming on.
How to Remove a Car Battery
An auto battery helps power car electrical systems. To remove a car battery, you will need work gloves, safety goggles, and basic hand tools.