![]() Again, avoid letting the charger’s clamps touch the battery’s loose negative clamp. Your charger’s indicator light will signal when it’s done charging the battery. Disconnect the charger from the battery when it’s done. ![]() The longer you charge it, the more strength the charger can put in the car battery. It may take 10-24 hours to charge your battery up to 100 percent. Depending on your battery charger, it may take 4-8 hours to charge your battery enough to start the car a few times. If you’re using a smart charger, it may detect the voltage and battery type for you. Flooded and wet are car industry terms for a regular car battery, as opposed to an AGM battery, enhanced flooded battery or a lithium battery. ![]() Set the voltage to 12 volts and choose “flooded” or “wet” for the battery type.Be careful not to touch your charger’s terminals to the negative terminal you just disconnected. Your charger’s clamps should match the posts. Connect the charger to your car battery terminals.Disconnecting the negative will protect your car’s electronics from the charging voltage. Then put a rag or a glove around the terminal to prevent it from touching anything else. Disconnect the car’s negative (usually black) terminal.Losing power wipes their memory, and that can cause real car problems, including erratic idling behavior. Your car’s onboard computers need power all the time. Connect a backup battery to the On-board Diagnostics II (OBD-II) port.Consult any specific instructions for your charger. Take off any jewelry, put on gloves and put on safety glasses. Make sure you’re outdoors or in a well-ventilated area. That’s why you might need to hook it up to a charger. Your car’s alternator cannot fully recharge your car battery. if your car had a slow or sluggish start recently.if the ignition sounds different to you.if you left an interior light on overnight (but the car still starts.).if you notice odd behavior in your accessories.However, you may need to charge your car battery The alternator does enough to maintain a car battery through a normal battery lifetime of 3-5 years. Meanwhile, the charging system and the onboard computer regulate the alternator’s output. Once your battery starts the engine, the alternator charges it while you drive. Your car battery doesn’t have any of that. It's a lot of computation to lengthen that battery’s lifespan. They chat about voltage, amperage rates and float charge times. That’s how it can talk to your phone’s processor. For instance, your phone battery has a thin strip of electronics. They’ll follow exactly the right steps automatically. Most devices in your life (and their batteries) have electronics programmed with charging instructions. Your car battery isn’t designed like other electronics. We just plug in our phones, Nintendo Switch or electric toothbrushes whenever their batteries get low.Ĭharging your car battery takes a few more steps because it’s a manual process. We are so spoiled by our phones and household electronics. Let’s walk through how long it takes to charge a car battery, how to do it step by step and how to avoid overcharging.
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