1A Auto Video Library
Our how-to videos have helped repair over 100 million vehicles

How To Perform a Battery Load Test to Check Battery Condition

Share on:
  1. step : Testing Your Battery (0:20)
    • Disconnect your negative and positive battery cable
    • Connect to the negative and positive terminal with a tester
    • Hold down the test button for ten seconds

Brought to you by, your source for quality replacement parts and the best service on the Internet.

Hi Everyone, I'm Don from In this series of videos we're going to be focusing on vehicle diagnostic and maintenance tips. We hope that you find it helpful, and when you need parts for your car or truck, think of Thanks.

In this video, we're going to show how to load test your battery. The reason you might want to do this is if your battery or your car is sluggish to start in the morning, you hear that the starter is going and it's just not going as fast as it should, or maybe, occasionally you'll have to jump start your car. This is called a load and charging system tester. These are relatively cheap. It's not a bad tool to have in your garage.

Anyway, we're going to do it on this battery here, and you can see it's disconnected. I'm going to apply the positive terminal and then the negative terminal. What this is basically going to do is it's going to draw a load on the battery, and there's a little element in here that gets hot, and after 10 seconds you're going to be able to tell, based upon this gauge here, whether or not your battery is good or if it's got a bad cell in it, or it's just time to change it.

So what I'm going to do is go ahead and press the test button. I'm going to hold it down for about 10 seconds. I'm going to let go, and you can see that it's almost 13 volts. So, this battery is very good. You can feel here the heat from that element inside, and that's drawing the amperage out of the battery. So, now we'll go ahead and disconnect here, and disconnect here, and you see that we've a good battery.

Now, let's go ahead and do it on a battery that we know is bad. All right, we've got another battery here; we're going to repeat the procedure like we did on the other one. Hold down the button. This isn't looking good already. So, you can see that there's basically nothing left of this battery. So, this would obviously need to be replaced. This wouldn't even crank over your car.

We hope this video helps you out. Brought to you by, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.

Tools needed for replacement:

    Diagnostic Tools

  • Battery Tester

Digital 12v Battery Analyzer

Battery Tester Performance Tool

This part replaces:

  • Reference Number W2998
  • Performance Tool W2998

Part Details

  • Tool Display: Digital Display
  • Battery CCA: Works on 200-1200 CCA Batteries
  • Power Source: 12V Vehicle Powered
How to Replace Wheel Bearing & Hub 99-06 Chevy Silverado 1500

How to Replace Wheel Bearing & Hub 99-06 Chevy Silverado 1500

Learn how to replace your own wheel hubs on your 00-06 Chevy Silverado or Suburban or GMC Sierra or Yukon. In this video, the expert mechanics at 1A Auto will show you how to replace a hub that's vibrating, groaning or loose.

Search Videos
Go To Top


Same Day Shipping

In stock orders ship same day when ordered by 2pm ET. Need your part faster? Choose expedited shipping at checkout.


Guaranteed to Fit

Our team of auto experts work hard to provide you with the highest quality, direct fit replacement auto parts. We know not all auto parts are created equal. This is why we enforce a strict level of product standards and sourcing with every part.


USA Customer Support

Our goal is to exceed our customers' expectations every day. We are a team of passionate auto enthusiasts who are here to help. If you have a question about our parts or a repair contact us.


Instructional Video Library

Our 1A Auto Video Library has thousands of how-to auto repair installation videos specific to year, make and model. Each video guides you with step-by-step instructions to empower you to tackle your own repairs on your car, truck, SUV, or van.