![]() Many battery chargers deliver two to six amps (some allow you to choose the amperage level) and will take at least several hours to recharge a dead car battery. Other chargers work differently they may not shut off automatically but rather have gauges that let you know when the battery is charged. The Optima charger will automatically shut off when the battery is fully recharged. The Optima charger that we're using here has a switch that sets it for either a motorcycle or car battery or one of Optima's high-performance batteries. For the greatest safety, keep the charger as far away from the battery as the cables allow. Give the clamps a little wiggle to ensure that they have a good connection to the terminals. Read the instructions that come with the battery charger, as each charger operates a little differently.Īttach the charger's red clamp to the battery's positive terminal and the black clamp to the negative terminal. Next, make sure your battery charger is unplugged from the wall socket-it uses household current to charge the battery-and that it's switched off, just to be doubly sure there's no current flowing through it. Most auto-parts stores carry chargers and they're readily available through online retailers such as Amazon. In the following videos, we use an Optima charger that we have had good experience with in the Car and Driver garage. Better still, if a friend or relative has one that you can borrow, you're in luck. ![]() If you're intent on recharging your battery, you're going to need a battery charger. If the battery won't even take a charge, it's almost definitely dead and needs to be replaced. But if it then dies a couple of days later, it could be either a failing battery or the fault of something else in your car's electrical system-starting with the alternator, which supplies electricity to run the car and charge the battery. If the battery takes the charge and you can restart your vehicle, it might not be totally dead. Attempting a recharge will also help you know if you need a new battery. Did you leave the headlights on last night? Or an interior light? Either of those could be enough to run the battery down. The best thing you can do when your battery goes flat suddenly is to figure out why and what shape it's actually in. How to Disconnect Your Vehicle's Battery.
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