When carrying out any electrical work to your car, it is usually necessary to disconnect the battery first. This brief guide will explain the best way of going about this. Disclaimer – always check your manufacturers handbook for instructions to locate and disconnect the battery as each car differs. Rubber gloves may be handy to prevent and grease, oil or electrical sparks during this exercise. If you’re worried at all about the procedure do not hesitate to contact a car mechanic to help you. Show
 Locate the batteryYou should find the battery is a rectangular box under the bonnet of your car. However, many newer cars now have a cover for the battery (with a battery symbol on top of it) which you will have to slide off or lift up to locate the terminals. If you’re finding it difficult to locate the battery, try reading your handbook for the right location. Recognising positive and negative/ground terminalsNext it’s a good idea to discover which terminal is positive and which is negative. The general rule of thumb is the positive terminal will have a ‘+‘ sign on it and the negative terminal will show a ‘–‘ symbol. Sometimes you may also find the positive has a red cable colour and the negative a blue colour but please double check your handbook in case this differs. Negative firstIt’s important to disconnect the negative side of the battery first, otherwise you can cause an electrical short if the positive is removed first. For instance, if you accidentally drop a spanner on the positive terminal and the spanner touches anything else that’s metal on the car you’ll create a circuit and short the battery, or even worse give yourself an electrical shock. To remove the negative cable, loosen the connector and carefully wiggle the clasp off the terminal. Next remove the positive connector in the same way. Handy tip – to prevent the connectors touching anything else on the car whilst they’re disconnected, get a plastic tie or similar and attach them to something which keeps them out of the way and not touching anything metal! Reconnecting the car battery – positive firstOnce you’re finished with the electrical work on your car, you can go ahead and replace the connectors back on to the terminals. Make sure you start the way you finished, reconnecting the positive terminal first and then the negative afterwards to prevent short circuits. Push the connector back on and give it a good wiggle to ensure you have a snug fit. Try to prevent touching any other metal work on the car with the negative connector. You may notice a small spark when reconnecting the negative terminal, but this is normal and shouldn’t be dangerous. You are simply starting the electrical circuit again in the car. Cover the battery and close the bonnetAll that’s left now you’ve reconnected the battery is to replace any battery cover(s) you removed at the beginning and then close your bonnet. Hopefully the electrical work you’ve carried out has been a success! If you find you haven’t got any electrical power, check the terminals are clean and free from dirt and try again. Failing that, you may have shorted the battery if you touched the negative terminal on any of the car’s metal work. If you need further advice on your car’s battery or anything electrical, MCM Garage are happy to help. Just give us a call today on 01761 415 501 or contact us via our online form and we can set-up a quick appointment. Did you know that there’s a specific order that you need to follow when disconnecting your battery terminals? In this article, we’ll show you how to disconnect a car battery safely, so you don’t harm yourself or your car. We’ll also go through some FAQs, including why you might need to disconnect the battery and an easy way to replace the car battery. This Article Contains
Let’s dive right in. Disconnecting your car battery is a relatively simple process. It involves these 5 steps:
However, before you get started, you’ll need some battery removal tools and safety measures in place: Tools NeededBattery terminal bolts aren’t a standard size — they can be a single bolt, a clamp, or a bolt and nut pair. So it’s best to have a socket wrench kit, an adjustable wrench (pliers) ready to cater to different sizes and forms. You may also want some anti-corrosion grease or rust spray on hand. Safety MeasuresBefore beginning work on the car’s battery, here are some precautions to keep you and your vehicle safe:
Also, note that some electronics (like the clock, radio, or the engine control module) may lose their settings without battery power. To prevent this, you may want to use a car memory saver to retain those settings. It’s also a good idea to check your car manual to see what electronics will be affected by the loss of battery power. Once you’ve taken care of all of that, you can start disconnecting your battery by following these steps: Step 1. Turn Off Ignition And Locate The BatteryTurn off the car’s ignition switch and remove the key. Most of the time, it’ll be in the engine bay. Once you’ve located the battery, check it for corrosion, damage, or leakage. If a car battery terminal is heavily corroded, disconnecting the cable clamp or connector from the battery post may be more challenging. Don’t try to force the connector off, as you could break the battery post. In this case, you’ll need to loosen some of the corrosion first. A solution of water and baking soda, and the aid of a wire brush, can help to clear corrosion. If you want a detailed walkthrough on how to remove corrosion, check out our related post on battery corrosion guide. If the car battery is damaged, bloated, or leaking, don’t work on it. Step 2. Disconnect The Negative Battery Terminal FirstSome battery terminals are covered with plastic caps that you’ll have to remove. The negative battery terminal is usually marked with a minus (-) symbol and has a black cap. The positive terminal typically has a plus (+) symbol and a red cap. When disconnecting a car battery, always remove the negative connector (negative clamp) from the negative terminal first. This helps to avoid an electric issue like sparks and shocks and, in some cases, battery explosion. How do you disconnect it? Important: Don’t let your adjustable wrench touch both terminals simultaneously, as you’ll create an electrical path. Once the negative connector and negative cable have been released, remove them and keep them aside, away from the battery and positive terminal. Step 3. Disconnect The Positive Terminal SecondAfter the negative car battery terminal is disconnected, do the same for the positive terminal. Loosen the positive connector and positive cable with the pliers, then keep them away from the battery and negative cable. Don’t let the positive connector touch any metal part of your car, as it can carry a residual current that may damage or disrupt vehicle circuitry. Step 4. Detach Holding Mechanism And Remove BatteryMost batteries are secured to the battery tray with a holding mechanism. This is usually a bracket or strap. Find the holding bolts and loosen them so you can detach the holding mechanism. Some bolts are close to the base of the tray, and you may need to reach further down with the socket wrench. Batteries can be surprisingly heavy, often weighing between 40-60 lbs. If you’re removing a flooded lead-acid battery, lift it straight up to avoid sloshing the battery acid inside. Then, place the old battery on a level surface. Step 5. Clean The Battery Tray And Battery Cable ConnectorOnce battery removal is complete, you’ll want to clean the battery tray and cable clamp or connector for future use. Do this irrespective of if you’re installing a new car battery or just taking the car battery out for a recharge. Clean the battery tray and connectors of any dirt and corrosion, then spray it with an anti-corrosion compound. Always make sure each battery cable is secured out of the way. What’s next?
Note: Disconnecting and reconnecting a car battery isn’t difficult and is something you can do yourself with a little bit of care and attention. However, always get a professional to handle the task whenever you’re in doubt. Now that you know how to disconnect and remove your car battery, let’s go over some FAQs. 6 Car Battery FAQsHere are some answers to common car battery questions: 1. Why Would I Need To Disconnect The Car Battery?There are many reasons for disconnecting the car battery from the engine bay. A. Replacing A Faulty BatteryPutting in a new battery is one of the most common reasons for disconnecting the battery. B. Recharging A Flat BatteryYou may want to use a battery charger to recharge a flat car battery. Sometimes you don’t have to remove the battery from the engine bay, only disconnect the cables and hook the battery to the car battery charger. If you’re uncertain about using a battery charger, get a mechanic to handle the task for you. You’ll also have the benefit of asking them to test it for you to find out why there’s a battery drain in the first place. C. Cleaning Battery CorrosionCorroded battery terminals should be cleaned, as corrosion affects battery performance and can shorten its life. It’s often a good idea to take out the battery from the engine compartment when cleaning to prevent corrosive elements and cleaning agents from falling on engine parts. D. Performing Car MaintenanceSome car maintenance procedures may require the battery to be disconnected or taken out of the way to access engine parts. E. Storing A Car For An Extended PeriodIf you plan on storing a vehicle for an extended period, it’s advisable to disconnect at least the negative terminal from your car battery. This prevents unnecessary battery drain, as a fully charged battery can hold its charge for 6-12 months if you do this. Alternatively, you can use a battery disconnect switch (also known as a kill switch) which attaches to the negative terminal to cut the electrical connection. The battery disconnect switch makes an excellent anti-theft device for other times too. And finally, if you plan to leave your battery unused for a long time, you may want to attach it to a battery tender to help maintain its charge. The battery tender ensures that it can be up and running when you need it again. 2. What’s A Lead Acid Battery?The lead acid battery is the most common car battery type. It can be in a wet cell (flooded) or a dry cell (gel or AGM) format. The battery generally consists of lead plates and battery acid (a mixture of water and sulfuric acid). However, lead acid batteries aren’t the only type of battery out there. 3. What Does The Car Battery Do?The primary battery function in the car is to provide a spark to the starter to crank the engine. The car battery also provides power for every electrical component in your car — from the headlights to the onboard computer. When your car is running, the alternator recharges the battery. But your battery runs on its own stored charge when the engine is off. This is why it’s essential to avoid unnecessary drain from any electrical system (like the headlights) when you’re not running the car. 4. Can I Recharge A Dead Battery?Successfully recharging a dead battery depends on how depleted the battery is. This is a good time to have a voltmeter or multimeter handy, so you can measure your battery voltage and have an idea of its state of charge. If the battery voltage is 12-12.4V, it still has about 25-75% of its charge, but not enough to start the car. In this case, you can pull out the jumper cable, jump start the car and take it for a drive to let the alternator recharge the battery. Minimize the use of any electronics and keep the car above idle as much as possible. Aim for about 30 minutes of driving. If the battery voltage is under 12V, the battery is fully discharged. You can still use a jumper cable to start the car but charging with the alternator is not advisable when the car battery is this depleted. It’s better to use a dedicated car battery charger to recharge a depleted car battery. Just be aware that a very old battery could be unrecoverable. Learn more about why your car battery might not be charging. 5. What Mistakes Can I Avoid When Replacing My Car Battery?Here are three crucial mistakes every car owner should avoid when replacing a car battery: A. Waiting Too LongMany car owners make the mistake of waiting too long before replacing a failing battery. This could eventually lead to your car breaking down or a severe accident. It’s a good idea to be preemptive and replace your car battery as soon as possible. B. Using The Incorrect BatteryYou don’t want to waste money on a battery that isn’t going to work in your car. You can find the correct battery by reading some car reviews and learning about basic battery specifications for your particular vehicle, like:
C. Going For The Cheapest OptionMost car insurance plans don’t cover battery replacement costs, but this doesn’t mean you should go for the cheapest replacement option. While it can be tempting to look for a cheaper battery, it might not provide enough power for every electrical component in your car or even last as long as you’d like. Instead, as a car owner, you should consider investing in one that offers improved specifications, features, and lifespan. Learn more about how long a car battery lasts. 6. What’s An Easy Way To Replace The Car Battery?If your car battery fails, the battery warning light or check engine light will probably illuminate on the dashboard. But there’s no need to panic. What’s RepairSmith?
Car battery replacement costs will vary based on the car’s make, model, and location. For an accurate estimate of the cost, fill out this online form. Final ThoughtsDisconnecting a car battery isn’t hard to do. The most important thing to remember is that the negative terminal comes off first. And when you’re reconnecting the battery, just reverse the sequence. However, if you have other battery issues and want to be extra safe, just contact RepairSmith and let our expert technicians perform the car battery replacement and other repairs right in your driveway! Which battery terminal must be disconnected first and why?Removal of Old Battery
Remove the negative (-) terminal first. This precaution is necessary to avoid damage to wiring and the battery by accidentally grounding tools. Remove the positive (+) terminal.
Which side of the battery Should I disconnect?The negative terminal will be marked by a minus sign and black cable, and the positive with a plus sign and red cable. For safety purposes, always disconnect the negative cable first. Use your wrench to loosen the nut that connects the negative terminal of the battery, then remove the nut completely.
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Which side of a car battery should be disconnected first
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