It’s worth noting that this process will also work on a PHEV or mild hybrid as well - it’s the same series of steps, except you’ll hear a “Vroom” when the ICE engine starts. Once it’s running, you can disconnect the jumper cables (as before, be careful to ensure that the clamps don’t touch each other until both batteries are disconnected). Start the “good” car, and leave it running, or “on.” Note: if the “good” car is ICE-powered, do not sit there revving the engine - just leave it idling, as the alternator should be providing more than enough current to jump the “dead” battery.įinally, try to start the EV with the “dead” battery. Make sure that the cables are clear from any moving parts (we’re talking about an EV here, so there shouldn’t be many), and that the clamps securely attached to the battery terminals on both cars.
Next, place the BLACK negative (–) clamp to the negative (-) terminal on the “good” battery, then connect the BLACK negative (-) clamp to the negative (-) terminal (or a grounding point) on the “dead” battery. Being careful not to let the black and red connectors touch, attach the other RED positive (+) clamp to the positive (+) terminal on the “good” battery.
That means the headlights, windshield wipers, interior dome lights - anything that will draw on the battery.Ĭonnect one of the RED positive (+) clamps to the positive (+) terminal on the “dead” car battery. If you are using a jump box, just go on to the next step. Make sure both vehicles are off, in “park” (or, in a manual-transmission car, neutral), and have the parking brake engaged. Unplug the car.Īssuming you’re using another car (not a “jump box”) to jump-start your EV, position the two cars close enough to each other that the cables can reach both 12V batteries, but not touching. Doing so could do cause serious damage to people and property. To repeat, DO NOT attempt to jump-start the 12V battery while the car is plugged into an outlet or - worse! - a DC fast charger. The first thing you need to do is make sure your EV is disconnected from the charger. What’s more, it’s done in just about the same way as the ICE car you’re probably used to. The good news is that, yes - you can quickly and easily “jump-start” the 12V battery and, assuming you have some electrons in the “tank,” get on your way. That’s the long way of saying that, if your 12V battery dies, it’s not going to power up the ECU and CAN bus, and it’s pretty likely that you’ll be stuck, unable to convince your car to move under its own power. It powers the lights, the seats, and the onboard computers … the very same onboard computers that both turn the car “on” and manage the charging for the 400 or 800V batteries that you probably think of when you hear the words, “electric car battery.” The first is a 12V system that would be familiar to most shade-tree mechanics because its battery does all the same stuff the 12V battery in a gas car does. Hybrid and electric cars work a little differently, however, in that they have two electrical systems. That means their 12V car battery powers the lights, the power windows, the heated seats, the onboard computers, and - its heaviest load - the electric starter that cranks the engine. See, conventional ICE-powered cars have a single 12V electrical system. The answer is a resounding and assertive, “it’s complicated.” Again, we’re not covering any new ground here, but what happens when the car with the dead battery is electric? Can you jump-start it? Then it’s red-red, black-black, turn the key, and that’s it - you can get where you need to go (which, at this point, is probably somewhere that sells car batteries). All you need is another one and a set of jumper cables.
If you have an internal combustion engine (ICE) powered car, you don’t need to wait around for Roadside Assistance or some futuristic tow truck to show up. Your battery is dead, and you’re going to need a jump to get going. Maybe it chugs along for a second or two before you hear that dreaded “tick-tick-tickickick” and then, nothing. It’s a common experience - you walk out to your car one cold, winter morning, and it won’t start.
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