
A battery tester is an inexpensive alternative to a multimeter for testing the battery and charging system. It can tell you if the alternator is not charging the battery or if the battery is failing, and it can read measurements like volts (V), state of health (SoH), state of charge (SoC), cranking amps (CA), and more. This post reviews how to use a battery tester to test the battery and the charging system yourself.