Is Corrosion a Sign of a Bad Battery?
Corrosion is a white, blue or greenish powdery substance that accumulates around battery terminals and posts, impeding their ability to transmit electricity between themselves and engines.
Your vehicle’s lead-acid batteries feature small vents to release sulfuric acid gases. These gases interact with copper terminal clamps and electricity passing through them to cause corrosion of them and further harm the battery.
Your car battery is an integral component of its electrical system, providing power for everything from headlights and stereo to power windows. However, if its terminals become corroded this could impede how efficiently it delivers this vital resource.
Corrosion usually manifests itself in the form of white or blue powder covering one or more metal terminals, posts, or cables on your battery. Corrosion results from hydrogen gas escaping from your battery and reacting with its metal terminal or cable; this reaction can often be triggered by water or salty air under your hood; it could also be related to age of battery itself.
Rust doesn’t necessarily require replacement of your battery, but allowing corrosion to build can prevent its components from moving charge, potentially harming both it and your vehicle. Cleaning it off as soon as possible is important. Otherwise, corrosion could prevent charges from passing through its components, damaging both itself and your car in the process.
Before using any type of abrasive on battery terminal corrosion, be sure to disconnect all cables. This can protect you from receiving an electric shock should there be any acid still leaking from terminals or loose wires underneath them. Once you’re finished disconnecting the battery, a stainless steel wire brush can help scrub away all remaining corrosion until all trace of corrosion has vanished from its surfaces.
Once the battery terminals have been properly secured, it’s wise to coat them in grease (high-pressure grease or wheel bearing grease works well) in order to reduce further corrosion and keep your battery functioning smoothly and extend its lifespan. If any large amounts of rust or corrosion form in one area of your battery terminals, contact a professional immediately in case there may be severe damage that requires replacement of one terminal end.
2. Sulfur Smell
Corrosion of your battery can produce a telltale sulfur smell that’s an early indicator that something’s amiss. When sulfur compounds such as sulfur dioxide, thioethers, and mercaptans react with air, moisture, copper, they produce hydrogen sulfide gas which has an unpleasant odor reminiscent of burnt matches, rotten eggs or skunk spray – and can even cause eye, nose and throat irritation in humans as well as animals. If hydrogen sulfide has been detected near your battery, make an appointment immediately with a technician so they can inspect and repair it.
Corrosion of batteries occurs when their metal posts and terminals come in contact with sulfuric acid and hydrogen gas contained within. Many batteries feature small vents through which these gases escape. Over time, these fumes mix with the water in the electrolyte or oxygen in the atmosphere to cause corrosion; depending on where and how often your vents open, some gas may escape through these vents directly to contact terminals or cable connections and cause corrosion there too.
Chemical reactions will corrode a battery over time and reduce current flow, eventually resulting in its demise. When this occurs, you’ll likely require a jump start to get your car going again, while accessories like radio and cabin lights may no longer function correctly.
Corrosion of sufficient severity can cause metal corrosion to wear away the terminals of your battery and make it unable to transmit power for engine, electrical and vehicle systems. This is especially vital for vehicles equipped with manual transmissions since power from your battery enables engaging gears and turning your wheels.
Although you may be able to prevent some forms of battery corrosion, eventually all car batteries reach their end of their lives. Corrosion may result from age, improper maintenance or severe weather conditions – usually it serves as an early indicator that it’s time for replacement – it is wise to invest in this smart decision now in order to save yourself costly repairs in the future.
3. Slow Engine Cranking
If your car has become more difficult to start than usual (especially on cold mornings), it could be time for a battery replacement. Your battery provides power for starting and other functions in your vehicle such as windows or audio, making its condition key for optimal functioning.
Regular flooded lead-acid batteries contain a mixture of sulfuric acid and water that reacts with metals within to produce electric current. During this process, hydrogen gas is also created and vented out the top of the case; when this gas interacts with metal terminals on a battery it can lead to corrosion — usually visible as brown, white, or green discolorations at its terminals.
Corrosion on battery terminals can impede the transfer of charge between your battery and vehicle, forcing the former to work harder than necessary in starting your car, eventually wearing out more quickly than otherwise.
Corrosion can make terminal connections harder, hindering proper electricity flow and potentially harming both your battery and electrical components. If you suspect your battery might be failing, get it tested before proceeding further – load testing can show whether or not it needs replacing.
Cleaning battery terminals is generally straightforward, though it’s wise to always take precautions when working with lead-acid batteries, such as wearing eye protection and mechanic gloves as well as working in an area with adequate ventilation. If the corrosion is severe enough, professional assistance should be sought instead.
Baking soda may be used to remove corrosion from a battery terminal, but only as a last resort. A full solution of water should then be used to neutralize battery acid and stop further corrosion. If you don’t have access to professional help, be sure to use a battery brush or wire cleaner with instructions provided on its package for safe removal of corrosion.
4. Dim Headlights
If your headlights seem dimmer than usual, this could be an early indicator that your battery is starting to fail. Car batteries power many components and accessories in your vehicle including headlights, radios, dashboard lights, power seats and windshield wipers; so any change or dimness could indicate battery or alternator trouble. For safety’s sake it would be prudent to have both tested for possible issues.
Your headlights are one of the most essential safety features on your vehicle, especially at night or during inclement weather. Dimmed headlights should serve as an early warning that something needs to be addressed immediately by an expert, possibly because your battery doesn’t supply enough power to your light system.
There’s also the possibility that your bulbs have gone dim over time; all bulbs gradually dim with use and may need replacing soon if yours have. A light that’s going out will often feature yellowish or cloudy tinted interior walls; to remedy this situation, consider purchasing new bulbs instead.
Dim headlights may also be due to an alternator failure. An alternator recharges your battery as you drive around, so if it begins to malfunction it can disrupt this flow and lead to components underperforming as electricity becomes restricted in their flow.
Corroded ground wires can also contribute to dim headlights. Ground wires connect bulb circuits to your car’s frame, so any damage or corrosion to them could prevent your headlights from receiving enough voltage to operate at full brightness.
Cleaning corrosion from battery terminals can be accomplished using a solution of baking soda and water. Simply coat corroded parts of your terminal with baking soda before slowly pouring water onto it to create a chemical reaction and eliminate corrosion. Additionally, battery terminal cleaner spray or grease such as AMSOIL Heavy Duty Metal Protection may help reduce further build-up; simply spraying onto these areas will keep them free from corrosion build-up.