The 10 Best Auto Battery Testers

We spent 45 hours on research, videography, and editing, to review the top choices for this wiki. Whether you are having difficulties with getting your car or boat to start, or you just like to preempt any problems, these auto battery testers are capable of providing a complete system diagnosis, including testing the load, the starter motor draw, and the battery’s overall health, so you know if it is near the end of its life. When users buy our independently chosen editorial picks, we may earn commissions to support our work.

10. OTC Heavy-Duty

The OTC Heavy-Duty features an ergonomic design with a well-placed operating switch, and it can be used on both top- and side-post units. It also offers onboard clamp storage, and has built-in rear brackets, so you can mount it on a wall or keep it in a toolbox.

  • Extra-large analog display
  • Just 10 seconds to produce results
  • Cables are rather short

Brand OTC
Model 3181
Weight 3.1 pounds
Rating 3.9 / 5.0

9. Suner Power Analyzer

The Suner Power Analyzer is compatible with a variety of battery types, including AGM, gel, and marine, and the large LED screen lights up, making it easy to read. It also has a built-in reminder function that beeps to let you know when it’s finished.

  • Heavy-duty clamps
  • Also available in red
  • Instructions are not very clear

Model SP-C12002
Weight 12 ounces
Rating 3.7 / 5.0

8. Schumacher 100 Amp

The Schumacher 100 Amp boasts a shock-resistant meter and well-insulated copper wires that conduct the testing load safely. It works well on boat batteries, too, and includes a helpful color-coded display that DIYers can understand.

  • Wallet-friendly price
  • Graphs for 12v and 6v testing
  • Doesn’t always detect bad cells

Brand Schumacher
Model BT-100
Weight 2.7 pounds
Rating 3.7 / 5.0

7. QuickLynks Cold Cranking

The QuickLynks Cold Cranking can test the condition of charged and discharged units and display those results in six different languages. It’s very compact and weighs less than a pound, so it’s perfect to keep under a motorcycle seat or in a glove compartment.

  • Can export data to a pc
  • In- and out-of-vehicle testing
  • Produces consistent results

Brand Quicklynks
Model BA101
Weight 9.6 ounces
Rating 3.7 / 5.0

6. Clore Automotive Solar

The Clore Automotive Solar is a nearly universal option that offers a 7- to 15-volt operating range, making it very accurate even when batteries have already lost most of their charge. It is also equipped with a number of safety features to prevent damage.

  • Step-by-step testing sequence
  • Brightly backlit lcd screen
  • Small enough to fit in a toolbox

Brand Clore Automotive
Model BA9
Weight 12 ounces
Rating 4.1 / 5.0

5. Auto Meter Handheld

The Auto Meter Handheld can detect issues like bad cells and discharged units, and will also give you a health report, so you know if your battery is near the end of its life and needs to be replaced. Plus, it conveniently stores the last 100 results in case you need them.

  • Produces a 40-amp test load
  • Also works on 6v systems
  • Heavy-duty 16-gauge leads

Brand Auto Meter
Model SB-300
Weight 2.4 pounds
Rating 3.7 / 5.0

4. Midtronics System

The Midtronics System boasts a wide measurement range from 100 to 1,400 cold cranking amps and delivers test analytics quickly. It’s a favorite among professional mechanics because you can use it on a daily basis without worrying about the internal components failing.

  • Also checks alternator efficiency
  • Bright easy-to-read screen
  • Detects bad cells

Brand Midtronics
Model PBT300
Weight 1.2 pounds
Rating 3.9 / 5.0

3. Foxwell Digital

The Foxwell Digital can analyze the conditions of both 12- and 24-volt systems. It provides accurate data, including the amount of cold cranking amps, and has a multilanguage, user-friendly interface, making it simple for anyone to operate.

  • Includes a sturdy storage case
  • Displays results in under 3 seconds
  • Compensates for ambient temperature

Model BT705
Weight 3.2 pounds
Rating 4.3 / 5.0

2. Motopower Voltmeter

The Motopower Voltmeter is ridiculously compact, so you could easily keep it handy in a car or on a boat, ready for use when the need arises. It comes in at a budget-friendly price that anybody can appreciate, and provides quick readings.

  • Reverse polarity indicator
  • 30-amp alligator clips
  • Intuitive operation

Brand Motopower
Model MP0514A
Weight 5.6 ounces
Rating 4.8 / 5.0

1. Clore Automotive Electronic

The Clore Automotive Electronic comes with a built-in printer that will produce a hard copy of your results, so there is no chance of you forgetting them. It also has an internal counter to track the number of tests performed and allocates a unique code to each one.

  • Up to a 30-volt operating range
  • Suitable for multiple battery types
  • Cable ends can be replaced as needed

Brand Clore Automotive
Model BA327
Weight 7 pounds
Rating 4.7 / 5.0

How Battery Testers Work

There’s nothing worse than going to start your car and having the engine not even try to turn over. That’s why a battery tester can come in handy, as it can give you a heads-up as to when your battery might be on its last legs before you make that afternoon drive across Death Valley in July.

Many modern digital testers require you to enter basic information about the battery before testing, such as its capacity. This gives the device a basis for telling you whether the test is a pass, fail, or re-test. However, many old-school testers simply use a needle on a dial to tell you the health of the battery. Luckily, neither version is very complicated, and each will give you a basic answer, so there’s not a lot of room for misinterpretation.

Most testers are what’s known as analog testers, which means they measure the battery under load. Basically, they complete the circuit on the battery, allowing electricity to flow through it. This creates both voltage and current, which in turn give off electromagnetic waves. The more waves given off, the more life left in the battery.

These testers are very simple and extremely accurate. They look like jumper cables, and you hook them up to the posts on the battery in a similar fashion. Once hooked up, all you have to do is look at the readout to see how your battery is feeling at that time. It’s not as fun as hooking up jumper cables, though, because it’s harder to pretend to be Dr. Frankenstein and yell, “Give me life!” in the parking lot at Target.

Digital testers, on the other hand, draw power from the battery. They then measure the amount of power they’re able to siphon off, and give you a reading based on that. This is much less accurate, but good enough if you’re just interested in knowing whether the battery will start for the rest of the day or not. Also, because they suck juice from the battery, you don’t have to worry about the tester going dead on you.

How To Stay Safe While Working On Your Battery

Car batteries are pretty phenomenal feats of electrical engineering, as they’re basically big blocks of electricity-on-demand. However, it’s important to remember that electricity has one goal, and that is to kill you, so keep safety in mind whenever you’re messing around under the hood.

However, the danger of getting shocked is very low (especially if the battery’s dead). That doesn’t mean that batteries aren’t still dangerous, however. Batteries give off hydrogen gas while charging, and hydrogen just happens to be flammable. That means that, if a spark occurs (while hooking up jumper cables, for example), it can cause the battery to explode. Also–hopefully this goes without saying–but don’t smoke while working on your battery.

Beyond the fact that explosions are generally undesirable when working on cars, having a battery blow up is especially bad, as they are filled with battery acid. Acid doesn’t like skin or eyeballs, so definitely wear safety goggles, gloves, and a long-sleeve shirt. The acid should be safely contained, but never tip the battery over or hold it upside down, and be especially careful if the casing is cracked.

Another thing to be on the lookout for is a rotten egg odor. If you smell that, get to a well-ventilated area immediately, as the battery has been over-charged and is giving off hydrogen sulfide. If you’re stuck in an enclosed area with the gas, it can kill you. This is more of a danger with older, lead-acid batteries, but it’s good to know regardless. Also, if you smell rotten eggs in any capacity and your instinct is to stick around and breathe in deeply, it may be time to re-evaluate some life choices.

Despite all these dire warnings, modern batteries are pretty safe to test and replace. However, keep in mind that there hasn’t been a safety protocol invented yet that can overcome boundless human stupidity, so stay safe and be smart while doing anything under the hood.

How to Get More Life Out of Your Battery

Car batteries are designed to last anywhere from 2-6 years with regular use. Now, that’s a pretty wide disparity in lifespan, and it’s how you treat your battery that will go a long way towards determining how much use you get out of it.

The primary limiting factor on battery life is the weather. Batteries get hot anyway, and if you add in a 100° day on top of that, you’re going to drain it faster. So, if you live in Phoenix, consider moving literally anywhere else. If that’s not feasible, however, be sure to park in the shade, and try to limit your driving when it’s a scorcher out.

Also, as you might expect, having a bunch of accessories constantly drawing juice can shorten its lifespan as well. This is especially true when the car’s merely idling, so if you’re waiting in a parking lot for someone, consider turning off the air conditioner and radio.

Short rides are a much bigger drain on the battery than longer ones, especially if you’re making frequent stops and turning the car on and off every time. This likely isn’t something you can avoid completely, but just be cognizant of it and try to limit it as much as possible.

Of course, leaving your lights on after you turn the car off is another no-no. You likely already know this if you’ve ever come back to find a dead car waiting in the parking lot, but it’s still easy to forget. Get in the habit of doing a once-over every time you exit the vehicle, making sure all interior and exterior lights are off. If you have small children, you can check to make sure you remembered to get them as well, but turning off the lights is what’s really important.

And finally, one of the best things you can do for your battery is test it often. While this won’t actually extend its lifespan on its own, it will give you a good idea of its overall health, and alert you to any needed changes if your driving habits are putting a strain on the battery. You’ll also be aware of when it’s getting close to kicking the bucket, so you can have a spare battery on hand when that sad day finally comes.

Basically, a battery is like a date: if you’re nice to it, it’s a lot less likely to leave you stranded on the side of the road.