Harbor Freight Tools


135 Amp, 6/12V Battery and System Load Tester

This 6/12V battery load and system tester is compact, portable, and easy to use.

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The VIKING™ 135 Amp 6/12V Battery Load Tester quickly and easily tests automotive batteries and charging systems. An intuitive reversed polarity indicator prevents incorrect hook-ups. Ideal for automotive, recreational vehicles, motorcycles, and marine use.

  • Tests battery capacity, alternator output, voltage regulation, and starting capacity
  • Precise system loading for accurate test results
  • Ergonomic design with insulated grip for comfortable one-handed use
  • Heavy duty copper clamps and cables for durability and higher amperage
  • Multicolor, easy-to-read battery health gauge
  • Continuous audible signal after 10 seconds for time-measured tests
  • Easy step-by-step instructions are printed on the housing for fast and precise testing

DC Volts
Amperage (amps)
Lead acid, standard, gel, marine, AGM (sprial, flat), and deep cycle batteries
Cable length
2 ft.
Display type
Analog gauge
Shipping Weight
3.31 lb.
CA Residents
Warning - Prop 65 Info
Note: Specifications are approximate and subject to change

We guarantee this product to be free from defects in materials and workmanship 90 days from the date of purchase. Limitations apply.