How to Test and Replace a Bad Car Battery (COMPLETE Ultimate Guide)

Is your car battery dead? Need a new car battery? Learn how to test if your car battery is bad and how to recharge a dead car battery. Also learn which car battery is best for your car. In this video I show you how to test your car battery with a multimeter, clean corrosion from the battery terminals, test your alternator, test for a parasitic draw, load test a battery, and replace a car battery properly. I also show the inside of a car battery with a bad cell and I show how batteries work with multiple grids and how they go bad with heat, vibration and corrosion. And finally I show you the main difference between the different grades of battery and which is right for you.

Tools and Products:
DieHard Battery:
Felt Corrosion Protectors:
Battery Load Tester:
Multimeter:
Battery maintainer:
Battery Charger:

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Disclaimer:
Due to factors beyond the control of ChrisFix, I cannot guarantee against improper use or unauthorized modifications of this information. ChrisFix assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. ChrisFix recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of ChrisFix, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not ChrisFix.

5 Comments

  1. Screw advance auto save you’re $100 for the same exact battery and go to Walmart. Literally 100% of car batteries in the us made by 3 companies. Vast majority by 2 of them. My car needed a smaller battery. Literally $100 more for the same exact thing vs Walmart. $130 more than at Costco.

  2. @FavianHarnarain-g2j February 21, 2026 at 1:12 pm

    I have a 2006 Mazda 3 hatchback sport model with the interstate mega tron 2 car battery with aftermarket subwoofer and amplifier in the trunk

  3. Great video. No wasted time BS like: showing your dog, talking on and on about irrelevant crap. Thanks for fast, facts and to the point.

  4. Yep, I suspected that vibration was wreaking havoc on my coil and battery. I need to isolate my battery. I’ve already replaced the coil. I do need a trickle charger. And there’s no way I’m buying a car with start/ stop technology even if you can turn it off.

  5. i know its been 4 years but i have a 2012 chrysler 200 lx (4cyl) my car battery is under my fuse box under the hood behind the left wheel well, and last night i think my alternator went out because my battery sat at 12.46 volts but then dropping to 11 something while car is on and then last night when i got home the battery was at 9 volts. Also got an oil leak that i have no clue where its coming from…

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