FJC Battery Testers

Have you ever attempted to start your car only to find it’s not turning over?  You think the battery is likely the issue but you’re never really sure.  Fortunately, if you own an inexpensive battery tester you can check the state of charge of your battery. This simple test can help reveal whether or not your battery is fully charged, or if you have a separate issue.

An automotive battery tester is an electronic device which enables you to test a car battery that you believe may have lost its charge as in the example above, or at any time to ensure that it is operating at optimum level.  By regularly checking your battery for signs of weakness or erosion you will be able to keep a close eye on battery function and fix potential problems before they arise.

FJC has several battery testers, from simple models to more complex devices.  We will highlight a few of them here.  Please visit to view our complete line, including our carbon pile battery testers (Parts 45115 and 45118).

(Always turn off your engine when testing your battery, wear protective gloves and eyewear, and follow all safety recommendations.)

Part 45110 combines quality and great value and is ideal for those who need to test 6 and 12 volt batteries up to 1000 CCA.  It can test the batteries of cars, light trucks, RVs, motorcycles, boats, ATVs and lawn tractors.  It is able to test the battery condition and run a complete system charging diagnosis.  It tests batteries of current draw, voltage and alternator performance.  This low-cost device is simple to use, offers super-grip color-coded battery clamps,  and offers quick and accurate readings which can increase the life of your battery by addressing problems early.

Part 45107 also tests 6 and 12 volt batteries.  This heavy-duty, ergonomically designed tester is a great choice for those who are on the road and want quick results.  The reliable tester offers results in just 10 seconds and offers an accurate reading of your battery’s condition.  With its uniquely designed clamps and extra  large display, this device is convenient and a great addition to any travel safety kit.


Part 45150 is one of three electronic-display battery testers offered by FJC.  This battery and electrical system analyzer tests 6/12/24/36 volt and hybrid systems.  It will display alternator output voltage and alternator ripple test and starter system draw.  This model comes in a convenient protective case.  UPDATE:  Part #45150 has been recently discontinued.


In addition to regular battery testing, there are things you can do to extend the life of your battery, including:

  • Limit short rides. Longer rides allow the battery to fully charge.
  • Frequently check your battery terminals and ensure the battery is properly seated and fastened.
  • Don’t run accessories like A/C or radio when the car isn’t running

LMK 2019