A dead battery can usually be revived in about ten minutes with jumper cables and a second car, or with a portable jump pack. The key is connecting the cables in the right order and then driving long enough to put charge back into the battery. If the car dies again within a day, or the battery is more than four or five years old, expect to replace it rather than keep jumping it.
Central Valley summers are hard on batteries. Triple-digit afternoons speed up the chemical wear inside, and the damage often shows weeks later, on the first cool morning or after the car has sat for a few days. Before reaching for cables, it is worth checking that the battery is really the problem.
Is it really the battery?
| What you notice | Likely cause | What to try |
|---|---|---|
| Rapid clicking, dim dashboard, slow or no crank | Weak or dead battery | Jump-start |
| Bright lights and a single loud click, no crank | Starter or its connection | A jump will not fix it; call for service |
| Engine cranks normally but never fires | Fuel or ignition problem | Check the fuel gauge; call for service |
| Starts after a jump but dies as soon as cables come off | Failed alternator | Do not keep driving; arrange a tow |
| Battery warning light, flickering lights while driving | Charging system fault | Drive straight to a shop only if close |
How to jump a car safely
- Read the manual first. Some vehicles have remote jump terminals under the hood or in the trunk because the battery itself is hard to reach. Hybrids and electric cars also have a 12-volt battery that can die, and many use special jump points.
- Park the cars close, not touching, with both engines off, parking brakes on and the transmission in park or neutral.
- Clip the red clamp to the positive (+) terminal of the dead battery.
- Clip the other red clamp to the positive terminal of the good battery.
- Clip the black clamp to the negative (-) terminal of the good battery.
- Clip the last black clamp to bare, unpainted metal on the dead car, such as an engine bracket or a bolt, away from the battery. This ground connection keeps any spark away from the battery gases.
- Start the good car and let it run for a few minutes.
- Try to start the dead car. If it turns over, leave both running for a minute, then remove the cables in the exact reverse order.
Never let the clamps touch each other while any end is connected, and keep your face away from the battery. If the case looks swollen, cracked or leaking, or you smell rotten eggs, do not attempt a jump. Call a professional.
After the jump
Drive for at least a half hour on roads where you can keep moving, rather than idling in the driveway. The alternator needs time under load to recharge a depleted battery. Avoid shutting the engine off at the first stop; if the car will not restart there, the battery is not holding a charge. Many auto parts stores will test a battery and charging system for free, and the result tells you whether you need a new battery, a new alternator or just a long drive.
For a car that will not start even with a jump, or a vehicle with a failed alternator, the next step is a tow. Hybrids and EVs generally need a flatbed; see which truck your car needs before you call.
Why heat shortens battery life
- Faster chemical wear. Heat speeds up the reactions inside the battery, including the ones that wear out the plates, and it can evaporate fluid and corrode terminals. A battery that has spent three Fresno summers under the hood may be tired even if it still starts.
- Parking in the sun. Hot asphalt and direct sun push under-hood temperatures well above the outside air.
- Short trips. The alternator doesn't get long enough to top the battery off after starting.
- Accessories. A dash camera, a phone charger left plugged in, or an alarm can slowly drain a battery that is already aging.
As a rule of thumb, a typical car battery lasts about three to five years. If yours is getting close to that age, have it tested before the hot months arrive.
If you are stuck on a freeway
Do not try a jump with traffic passing a few feet away. On the main freeways through Fresno and Clovis, the Freeway Service Patrol can jump-start a dead battery free of charge during weekday commute hours; outside those hours you will need a roadside plan or a commercial service. The highway breakdown guide lists the patrol's hours and covers where to wait safely.
What a service call typically costs
A commercial jump start or battery boost is usually one of the cheaper roadside calls, commonly in the range of $50 to $125 for a passenger car, depending on time of day and location. Mobile battery replacement costs more because it includes the battery itself; plan on the battery price plus a service charge, and verify both with the provider. If you have a roadside membership or an insurance add-on, a jump is often included at no extra cost, which the roadside plan comparison breaks down.
Habits that prevent a dead battery
- Park in shade or a garage when you can during summer.
- Take a drive of 20 to 30 minutes at least once a week if the car mostly makes short trips.
- Clean white or blue corrosion from the terminals and make sure the hold-down is tight.
- Have the battery tested every year once it is three years old, ideally before summer.
- Keep a compact jump pack in the trunk; unlike cables, it doesn't need a second car.
Frequently Asked Questions
How long should I leave the cables connected before starting the dead car?
A few minutes with the good car running is typical. If the dead car clicks but still won't crank after five minutes, check the connections and try again once; repeated attempts won't help a battery that has failed completely.
Can I jump-start a hybrid or electric vehicle?
Often yes, but only at the points the manufacturer designates, and some cars may not be used to jump another vehicle. Check the owner's manual, and if it says to call for service, do so.
Why did my battery die in the summer heat?
Heat speeds up the chemical wear inside a battery. After a few hot summers, a three-to-five-year-old battery can fail without warning, often on the first cooler morning or after a few days of sitting.
Will a jump hurt my car's electronics?
Following the correct connection order and keeping the clamps from touching reduces the risk. Skipping the manual's instructions on a modern car is where problems start.
Should I replace the battery or keep jump-starting it?
Replace it if the car needs another jump within a day or two, or if the battery is more than four or five years old. A battery and charging-system test shows whether the battery is failing or the alternator is not charging it, and repeated jumps fix neither problem.