Problem with battery.

My battery terminal is corroded and the battery cables have broken off.
Experienced mechanics share their insights in answering this question :
The corrosion problem is due to the battery acid leaking onto the cables and causing the failures. The alternator may be overcharging the battery or it could be the battery temperature sensor causing the battery to be overcharged. The recommendation would be to have a qualified technician replace the two battery cables, battery, and then check the charging system for charging problems.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

In fact, corroded battery terminals are a common cause of reduced battery life and electrical problems in vehicles. Why? According to the Universal Technical Institute, “Corrosion on or around your battery`s surfaces can lead to increased resistance within the circuit, which can disrupt the electrical current.”
Introduction. Corroded battery terminals can cause several problems with your car. They can prevent the battery from fulling charging, drain the battery (resulting in your car not starting), and can also cause major damage to the alternator.
Battery corrosion is a poor conductor of electricity, as it increases resistance within the circuit. As a result, the increased resistance can lead to transient current flow, which typically leads to your car not starting.
Remove the connecting cables (first black, then red). Apply baking soda over the entire area that`s affected by corrosion. This will neutralize the battery acid. Add a small amount of water to activate the baking soda and cause a chemical reaction which will remove the corrosion.
If corrosion builds up on your car`s battery, it can interfere with the battery`s ability to function. If your car is having trouble starting or you notice problems with the electrical parts of your car, you may need to clean corrosion off the battery.
To neutralize the acid, you need to add a baking soda paste to the terminals. Either coat the terminals in baking soda, then spritz water on them or mix the paste beforehand and apply it to the terminals. Let it sit and bubble for a while to neutralize the corrosion, then wipe the terminals clean with a paper towel.
Over time, batteries can age and corrode, which can ultimately damage these devices` interiors, rendering them unusable.
Corrosion can drain power out of a battery and shorten its life. Battery corrosion is typically apparent at the terminals, a problem that can be resolved by careful cleaning.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

is the ecm the problem if battery light is on and the alternator isn’t bad
ANSWER : This is likely a sign of a failing voltage regulator. This is a unit that regulates the charging of the battery by the alternator. In your case, it sounds like the voltage output from the alternator may be much too high resulting in overcharging the battery and burning up wires in the process. I would recommend having an expert from YourMechanic come to your location to diagnose and properly test your vehicle’s charging system.

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I have Chrysler 300c. Battery light came on, changed battery and alternator but power still getting drained and battery light still comes on.
ANSWER : Hi, thanks for writing in. This may be a sign of a failing starter relay. The starter relay is a small unit near the starter that directs power to the starter from the battery. When this fails, it may cause a clicking sound and will not allow the starter to engage the flywheel when you turn the key. I would suggest having a professional from YourMechanic come to your home to diagnose your starting issue to determine the solution to get you back on the road.

Read Full Q/A … : Problem with battery.

Battery light stays on and overnight battery drain. 2006 Land Rover LR3
ANSWER : Hello – this problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. The specific components on that circuit can then be checked for current drain problems. A professional mechanic, like YourMechanic, can come to your location, and perform this procedure for you, and identify, replace or repair the failing component.

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Car battery light is on replaced alternator battery and starter and battery light is still on.
ANSWER : You may have a failing voltage regulator that could be allowing the alternator to supply too much or too little amperage to the battery resulting in the battery never maintaining a consistent charge as it is designed to. The voltage regulator is a unit that regulates the charging of the battery by the alternator. When the voltage regulator is not working properly, this may result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. A common sign of this is usually the acid inside the battery boiling causing the battery to swell. You may also smell a bit of smoke due to things potentially getting too hot. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

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I have a 97 Dodge caravan sport.. battery light is on, replaced battery, started and after two or three hours, battery light back
ANSWER : Hi there. Electrical issues like you are describing are typically caused by a constant parasitic drain. In most cases, this is due to an accessory relay that is faulty, allowing the component to constantly draw power from the battery. It could be other electrical problems causing this issue, so before you attempt any more repairs, it’s probably better money spent to have one of our mobile mechanics come to your location to complete a battery won’t hold a charge inspection. This will allow them to isolate the source of the drain and recommend the right repairs.

Read Full Q/A … : Problem with battery.

Auxiliary battery draining the hybrid battery
ANSWER : 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.

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Battery light stays on and overnight battery drain. 2006 Land Rover LR3
ANSWER : Hi there – yes, something is going on here that’s draining your battery. Perhaps the pressure of the engine wash dislodged wiring which has shorted, or there was a chemical reaction to the cleaning solution that caused electrical damage in the alternator or voltage regulator. These componnents can be checked off of the vehicle. Vehicle wiring can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. The specific components on that circuit can then be checked for current drain problems. A professional mechanic, like YourMechanic, can come to your location, and perform this procedure for you, and replace/repair the failing component.

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Hi Roberts. How would you rate a Subaru Outback battery compared with consumer reports best rated battery like diehard, and others
ANSWER : The very first thing to do is have the battery load tested. If the battery passes a load test be sure it is NOT a marginal pass in which case you should simply install a new battery to reduce diagnostic headaches. As far as buying a new battery, there are actually relatively few battery manufacturers and so a lot of the output is identical but just carries a different brand name. You would be wise to consult "Consumer Reports", as they have already done all of the required battery research for you and so you can safely and reliably purchase whatever they deem to be a top rated battery. If and once you replace the battery, be sure to measure the output of the charging system to confirm that the alternator is properly re-charging the battery. Please let us know if you have further concerns or questions as we are always here to help you.

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