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Batteries

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How To Jumpstart Your Car
A how-to guide to jumpstart your vehicle in the event of a dead battery. You'll need jumper cables, safety glasses, and a properly starting car.
How to Clean Battery Connections
Cleaning your battery connections, especially if the terminals are corroded, will help ensure the battery lasts longer and performs well.
How to Check a Car Battery
It never fails - you’re in a rush and the kids are throwing a tantrum in the backseat. You go to start your car and all you hear is a...
How to Diagnose a Car Battery Drain
It is safe to say that every car owner reading this has likely experienced that time where you were leaving your home or walking out to your sitting car,...
How to Change a Car Battery
Changing your car battery is a simple and easy automotive repair that you can actually accomplish yourself with the right preparation and a little physical strength. While most people realize...
How to Deal With a Dead Battery
If your battery appears to be dead, try a few steps to start your car before determining if it needs to be replaced or towed.
How to Care for Your Car Battery
How How to Care For Your Car Battery Your car’s battery tends to be neglected until there you have difficulty starting your car, and it is usually when the weather...
How to Fix a Car That Won’t Start
Having a car that doesn't start is frustrating. Try a battery test, fuel pump test, and check the spark plugs to help get your car started again.
How to Buy a Battery for Your Car
Your car battery is a storage device for the electrical power you need to start your car and operate your car’s options. If your car battery isn’t working as it...
How to Check Electrolyte Levels in Your Battery
Part of what makes a modern battery work so effectively is the ‘wet cell’ design they utilize. In a wet cell battery, there is a mixture of...
How to Change Battery Cables
Although simple in nature, battery cables are one of the most important components of a vehicle’s electrical system. They serve as the main connection between the vehicle’s main source of...
How to Use a Battery Charger
Most people who have been around cars for a good chunk of their lives have experienced the hassle and inconvenience associated with a dead battery. Sometimes it simply happens...
How to Buy RV Batteries
RV (recreational vehicle) batteries come in many different types, and what type is best depends on the useage and conditions the RV will be exposed to. Unlike cars, RV’s use multiple...
How to React If Your Battery Light is On
The battery light or charging warning light, available on the dashboard of your car, indicates malfunctioning or poor charging of the battery. This light illuminates whenever the...
Electric Cars and How They Work
Electric cars use an electric motor driven by a control unit. Their batteries are filled at charging stations and they produce no tailpipe emissions.
How to Attach a Car Battery-Mounted Power Cut-off Switch
Many people who store their vehicle for a length of time like to disconnect the battery from the electrical system of the vehicle. This prevents the vehicle from unintentionally draining the...
How to Replace a Key Fob Battery
Key fobs allow easy access to your car. Once the key fob battery is weak or dead you'll lose your fob's ability to control remote functions.
10 Best Miniature Jumper Packs For Your Car
Jumper cables and jumper packs charge your car battery when it needs a boost. The NOCO Genius Boost Plus is the best spark-proof, miniature pack.
3 Ways to Increase Car Battery Life
Car battery life is 2 to 6 years. Extend the life of your car battery with regular maintenance and turning off the headlights when the engine is off.
How to Replace a Car Battery Temperature Sensor
The battery has a battery temperature sensor that can fail if the Check Engine Light comes on, the battery voltage is low, or the RPM curve surges.

Related questions

Question
I have a short that drains the battery overnight.
There is a parasitic load applied to your battery with the ignition is off. Keep the test light on the battery and turn on one thing at a time and watch the light. If the light goes out, then that...
Question
The car won't start
It's possible you have a weak or dead battery. Consider that a strong possibility if your battery is 4 years old or older. First, have the battery load tested. If the battery is bad, replace the battery and then attempt...
Question
Battery Drain
If the battery is new and charging system output has been measured and is within specifications, the only reason a battery will discharge is if the car sits for a long period of time (batteries will self-discharge even if not...
Question
When i turn they key it just clicks could it be the battery or the starter?
Prior to performing diagnostics be sure you have a fully, 100% charged battery that passes a load test. Confirm that the engine immobilizer system (security system) is not activated thus preventing the car from starting. If the immobilizer system is...
Question
Car wont turn back on after being turned off, windows/radio turned off while car was running, dashbaord flickers on and off
The battery was loosing power and causing systems in the vehicle to shut down. Charge the battery up and have the alternator checked to see if its performing a 13.5 to 14.7 voltage and the proper amount of amperage. If...
Question
the ac/heater draining out the battery. took out the fuse, now it doesn't. need a new part? electrical problem?
The problem you are describing is, of course, due to current flowing in a circuit even when the circuit(s) has been commanded off. This is referred to as a "parasitic" load, sometimes know as a phantom load, too. The cost...
Question
Driving from Washington to Oregon when I got home battery boiled over. The 4 wheel drive dash lights and overdrive are on.
Hello. With so many lights indicating on the dashboard such as the check engine light and the overdrive light they will certainly be codes present inside of the transmission control module and engine control module. I suggest that a technician...
Question
Car will not Start. Battery Issue?
Hello. There's a possibility that the corrosion from the battery terminals have spread into the wires which is preventing sufficient power supply to the vehicle. The wires leading to the battery should be inspected. Likely after leaving the vehicle sitting...
Question
My alarm keeps going off and car won't start after changing battery, what can be wrong?
Hello, and thank you for writing in. When dealing with alarm and starting issues, you are really dealing with a miscommunication with the alarm system. If you have a spare key, try using it to disarm the system and start...
Question
Not running, starting, etc. - 2000 Hyundai Accent
Hello - if you are unable to get anything electrical to work on the car, with or without the key in the ignition (dome light when you open the door?), I would say you need a battery replacement](https://www.yourmechanic.com/services/battery-replacement) performed by...
Question
Doors don't lock/unlock from Key Fob or inside car, Key Fob doesn't open trunk, transmission locked, AUTO headlights not working
Hello, thank you for writing in. The charging system needs to be inspected. With the vehicle off, remove the negative battery cable and the the positive in order to remove the battery from the vehicle. From there you can inspect...
Question
I can get the car to unlock when I click the button and when I try the key in the door, it groans and doesn't move.
The door locks on a vehicle will unlock with a voltage above 5 volts. The groaning sound that you are hearing is the door lock actuators trying to operate as you move the door lock cylinder manually. Try starting the...
Question
Car showing various fault codes Ford (Transit?)
Hello - the P1631, if this is for a Ford Transit van as it appears, is most often a byproduct of a poor battery condition, with multiple cranking events before a successful start. I would check first for low starting...
Question
every few days i have to jump start my car
Hello. Yes a bad starter could cause a car to need a jump start every few days. Additional power provided by an extra battery could be enough to get a weakening started going again. Your vehicle may have a battery...
Question
I have a 2008 mercury sable is there a way to just replace the positive terminal or does the whole cable have to be replace. The o
If the damaged segment of wiring is short and self contained, that is the entirety of the cable (or harness) is accessible because there are connections (plugs or terminals) on both ends of the harness, it's not a bad idea...
Question
Idling and dashboard lights
You should have the battery load tested after the battery is fully charged up. The battery may cause erratic running and idle condition if the battery is bad or low on charge. The alternator should be able to recharge the...
Question
No power unless key is turned to on position
Hello, and thank you for writing in. This can happen when the battery is low, or has died recently. Although the fuses are good, make sure they are clean and have a solid connection. If these steps do not help,...
Question
My car goes click, click, click when I attempt to start. My lights,, horn, etc come on. What may be the issue? 2012 Honda
Hello - your symptoms suggest low voltage to the starter solenoid, or possibly burned starter solenoid contacts. Regardless, there is a voltage drop somewhere in your electrical system. If the battery voltage stay close to or above 12v with the...
Question
no spark fire no power to fuel pump computer won't communicate with code reader
Hello, thanks for writing in. When dealing with this kind of situation, you need to start with the simplest options, and work your way down the list. When the electrical power supply is questioned, we need to rule out the...
Question
how much would it cost to replace battery in 2007 BMW 525i?
The average quoted at this page is $212 but if you input your specific location you will get a more precise quote and scheduling options for the mechanic to perform the replacement at your location, at your convenience. Please let...

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