Simple DIY car battery replacement

Do you need to replace you car's battery? Batteries don't last forever, and specific usage conditions may wore out their juice much faster. A typical way to shorten a battery's life is to leave the car parked for prolonged periods: batteries can't keep their charge forever, and reaching the minimum charge level may cause critical damages. In this case it might be hard to even start up the car using an external battery. Don't worry though, replacing a car's battery is a rather simple task, although some care is required to accomplish the task properly.


In the first place it's necessary to find out which type of battery your car needs: manufacturers make batteries of many different sizes and electrical capacities, and you must purchase one that matches the requisites of your vehicle. Open the hood of your car, locate the battery and write down the battery capacity (expressed in Ah). You can find further information and recommendations in the car's manual or consulting specific forums online. Make sure to measure the size of your current battery, and check whether there might be room for a bigger one. You should now have enough data to make your purchase.

Pay attention when handling a battery and always keep it in its proper vertical position: it contains acid which might spill and cause serious damages. Wear protective gloves and goggles to perform these steps. To remove the old battery start disconnecting the negative terminal first (it will have a “minus” sign) and turn the cable away from the terminal. It's important to begin with the negative pole to avoid electrical problems. Repeat the operation with the positive terminal, remove all the screws that keep the battery in place and eventually move the battery out of the car.


To place the new battery you will just follow the steps in reversed order:

  • fix the battery with screws,

  • connect the positive cable to the positive pole first,

  • connect the negative cable to the negative pole,

  • make sure that the cables are firmly fixed to the terminals.


With newer cars it is recommended to wait a couple of minutes before turning on the engine, to allow any automatic operations (e.g. internal tuning of the air conditioning system) to be completed.

Enjoy your recharged car, and make sure to take care of it following a few simple tips for a correct car battery maintenance!


Follow your local rules regarding the disposal of used batteries. They contain acids and pollutants, and therefore require special care. Do not throw it away with common garbage!