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Top 8 Best Car Battery Testers

One of the most overlooked aspects of vehicle maintenance is to ensure that the battery is in good condition. Unexpectedly draining your car's battery can really change your day. A car battery tester is a cheap way to test your battery and make sure it's in good condition before you go out on the road.

Even better, get in the habit of checking your car's battery and the rest of your car's electrical system for signs of weakness from time to time. In this article, we'll look at the best car battery testers on the market today, covering a wide range of prices. Some testers are easier to use than others, while others provide richer data and other features. 

1. Editor's Recommendation: Autel MaxiBAS BT508 Car Battery Tester

Autel MaxiBAS BT508

As a result of the test, we think that Autel MaxiBAS BT508 is excellent in cost performance.

Autel BT508 Battery Tester is a powerful and lightweight battery and electrical system testing tool that uses advanced adaptive health battery analysis techniques. Download the free and easy-to-use mobile app for iOS and Android devices, run the test on Autel BT508, and view the test results. The MaxiBAS BT508 kit includes a Bluetooth wireless vehicle communication interface that allows battery and electronic device registration.

I connected the BT508 Car Battery Tester to one of the Optima Yellow Tops to test the battery (Note: it must be connected directly to the column) and the display immediately appeared. When you turn on the power at the bottom of the screen, you will see a small voltage reading. Next, you need to select the battery technology from the next screen. In this case, it is an AGM spiral winding. During a few tests, we found that the display slowed down at lower temperatures. It's easy to read the battery status. Next, I tried the normal function of the start-up and charging system with Mazda with a dead AC Delco Gold battery. The Battery Health Ripple test, which starts the car and keeps the revs at 2,500 rpm for 5 seconds, is much easier for two people. But it is possible and provides us with useful information (it is not in the charging system, including where our short circuit is). Our biggest complaint is that the display needs to be connected to the battery for it to work. This may not be practical for batteries mounted in the trunk due to the short leads. This is a great battery tester for occasional use, but if you use it several times a week, you'll need to upgrade to a printout or Bluetooth. We would also appreciate a suitcase or at least a storage bag.

The BT508 has a positive rating of 92% from over 2,000 reviews and is the highest weighted average in this category. Other Topdon battery tester models have similar values ​​of over 90%.

Autel BT508 Highlights:

Supports car battery testing inside and outside the car

6V and 12V battery tests: 100 2000 CCA

Start/charge system for tests 12 and 24

Flooding, AGM, AGM Spiral, EFB, GEL Battery Testing

Compatible with CCA, CA, SAE, EN, IEC, DIN, JIS, and MCA

One-click battery registration

Illustrated guide to battery location and testing

Read and clear the code for all available systems

Pros / Easy to use, easy to read, charge and start testing, compatible with all 6-12V vehicle batteries
Cons / Slightly expensive

2. Easy and Accurate: KONNWEI KW208 12V Car Battery Tester


As one of KONNWEI's most cost-effective products, the KW208 can test all 12V1002000CCA batteries, including regular floods, AGM flats, AGM spirals, and gel batteries. It provides an overall battery condition analysis so you can get an idea of ​​the battery condition in advance. The battery tester KW208 supports starting and charging system testing as well as alternator and starter testing.


-- Works as advertised. Calibrated for various cell types - normal submerged, AGM plate, AGM spiral and gel.
-- Measure health status, state of charge, cold crank current, internal resistance, and provide summary feedback: such as "GOOD -- RECHARGE" or "REPLACE" or "BAD CELL", etc.
-- Supports measurement of independent batteries and vehicles. For the latter case, crank performance and charging performance were also analyzed, along with a graphical representation of voltage versus time (to assess ripple).
-- Display contrast is debatable.
-- The last selected setting (eg battery CCA) is retained.

-- The unit is powered by the battery under test; once the LED is connected, it is powered; and vice versa. No internal battery to maintain power - eg. Review data. The startup time is short, so this isn't really an issue; however, it will be a future feature worth considering.

-- The screen brightness is not adjustable, some people may find it too high. Not a problem in a shop setting, but a little annoying in a home garage.

3. Cheap useful device: MOTOPOWER MP0514A 12V Digital Car Battery Tester


Voltmeter with LCD display and LED indication, It provides quick readings to determine if the vehicle battery needs to be jumpered or replaced and the status of the alternator output. Various colored LEDs indicate battery or alternator status, while the LCD digital screen simultaneously gives accurate voltage readings.

  • Compact design and lightweight
  • Plug and Play - Rubber Painted Housing
  • High precision - four-character digital display with lights, the accuracy is close to 0.01 volts
  • Reverse connection and overvoltage protection
  • 50cm/20" extension cable with 30A alligator clip

Pros / Easy to use and small hand held

ConsAll it does is measure the voltage

 4. Suitable for novices: Cartman 12V Car Battery Alternator Tester

Cartman 12V Car Battery Alternator Tester

*LED display indicates status
*Check before charging: the battery is charged, "OK" to charge.
*Alternator check: When the green light is on, accelerate the engine to 2000 rpm and the charging circuit is OK.
*Battery Check: Indicates the percentage of charge in the battery.
*Startup check: A red light indicates that the alternator voltage is too high.

That's right. It's so simple!

Pros / Great for no knowledge car people, Great for the price

Cons /  Looks Like a Toy, Clamps are way to small, Wire leads are too short.

5. Perfect addition to tool chest: FOXWELL BT705 12V 24V Car Battery Tester


FOXWELL's battery diagnostic testers are designed to analyze automotive battery problems and battery-related system problems. The BT-705 is specially developed for testing 12 volt conventional submerged, AGM/EFB flat, AGM/EFB spiral and gel batteries, start-stop AGM/EFB batteries with a capacity of 100-2000 CCA. It can detect failures in the starting and charging systems of 12V and 24V cars, SUVs, Mini-Vans, light trucks, marines, boats, motorcycles and even lawn mowers. Most device problems caused by the battery can be solved with the FOXWELL BT705. It provides a quick, simple and affordable solution for technicians to check battery health and detect failures in starting and charging systems. It is a professional battery tester for enthusiasts, small garages, auto repair shops, independent repairs.

Pros / An excellent time saving machine

Cons / There are a few misspellings in the firmware, Accuracy is sometimes questionable

6. Awesome little tester: TOPDON BT50


Great contraption for the DIY 'er or home mechanic. Definitely comes in handy if you're someone who owns a lot of toys (multiple cars, motorcycle boats or jet skis) and won't make you guess about the condition of your battery or charging system. It would be nice if it came with a case, but that's a small complaint...other than that I would recommend this to others.

Pros / Simple to use

Cons / Does not come with a case

7. Best way to test the CCA: MOTOPOWER MP0515A


Affordable Diagnostic Tool

Test the battery health, state of charge and internal resistance on your hands. Compatible with cars, motorcycles, trucks, RVs, ATVs, SUVs, boats, yachts, lawn mowers and even golf carts.

Wide range of test ranges and battery types

Compatible with all types of 100-2000 CCA lead acid batteries, including conventional flooded, AGM flat, AGM spiral, GEL and EFB. Battery standards include CCA, BCI, CA, MCA, JIS, DIN, SAE, etc.

Alternator Analyzer

Check the alternator starting voltage and the health of the charging system. View live output.

Pros / Easy to use

Cons / 1 year warranty not supported

8. Excellent for DIY: Schumacher BT-100 Battery Load Tester

Schumacher BT-100

The Schumacher BT-100 Battery Tester quickly and easily tests 6V and 12V batteries up to 1000 CCA and provides complete charging system diagnostics. It is ideal for car, small truck, RV, motorcycle, ATV, boat and lawn tractor batteries, making it a convenient general purpose tester. Includes a top-mounted rocker switch for simplified operation, heavy-duty color-coded battery clip, easy-to-read gauges, lacquered steel housing and a comfortable-grip, rubber-insulated carry handle.

Pros / Very good quality & Easy to use

Cons / Short term warranty

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