B400 - HEAVY DUTY Battery Condition & Charging System Tester


The B400 Tests 12V heavy-duty auto, truck, commercial and marine batteries and 12/24/36 Volt starter and charging systems including 42V Mild Hybrid systems. Battery size is not required to be entered into the unit. Simply choose between automotive or truck battery type batteries for testing. Eliminates tester input errors and allows the testing of batteries of unknown size. LED Bar Graph immediately displays battery condition upon pressing the TEST button. Includes 4 ft heavy-duty abrasion resistant cables for trucks with hard to reach battery compartments.


  • Battery condition is shown in percentage of capacity.
  • Tests 12V, 24V, & 36V Starting/Charging Systems
  • Tests 42V Mild Hybrid Starter/Charging Systems
  • Uses conductance technology
  • No conversion tables needed for CCA, SAE, IEC, EN or Ah.
  • Tests both flooded lead acid and AGM batteries
  • Multi-colored bar graph displays battery condition.
  • Low voltage LED lights when charging is necessary.
  • Extended 4 ft cables
  • Bad cell is detected and displayed.
  • Reverse polarity protection
  • Comfortable grip with easy to use clamps.
  • Patented circuitry
  • Made in USA

B400 Specifications

Battery Test Range: Auto 390 to 650 CCA
Truck >650 to 1700 CCA
DC Voltage: Range 3.9V to 49.9V/ +/- 2% of reading
Voltage Accuracy +/- 2% reading
Capacity/Volts Display LED- 4 digits
Battery cable length 48”
Bar graph 10 color-coded LEDs
Weight, lbs .75
Dimensions 7.5”L x 3”W x 1” H


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