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  • KINGBOLEN BM550 12V car battery tester and alternator charging system analyzer
  • KINGBOLEN BM550 12V battery tester key features including cranking test, charging test and battery health analysis
  • KINGBOLEN BM550 product structure diagram showing test clips, data cable and HD LCD display indicators
  • KINGBOLEN BM550 car battery tester for 6V 12V 24V batteries
  • KINGBOLEN BM550 quickly and accurately shows battery status
  • KINGBOLEN BM550 features wide compatibility with 6V 12V 24V batteries
  • KINGBOLEN BM550 safe design equipped with reverse connection protection
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Kingbolen

KINGBOLEN BM550

$31.99 USD
$31.99 USD
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Shipping calculated at checkout.

The KINGBOLEN BM550 is a compact 6V, 12V, and 24V battery tester designed to make routine battery checks fast and straightforward. Built for DIY vehicle owners, technicians, garages, and battery service professionals, it evaluates essential battery parameters including State of Health (SOH), State of Charge (SOC), Cold Cranking Amps (CCA), voltage, and internal resistance. Supporting 100–2000 CCA and battery capacities from 2Ah to 220Ah, the BM550 works with common lead-acid battery types including Flooded, AGM Flat Plate, AGM Spiral, EFB, and GEL batteries. Advanced conductance testing and an intelligent microprocessor deliver results within seconds, while the clear 1.8-inch display provides an easy-to-understand indication of battery condition. Simply connect the clamps and start testing—no separate battery or external power supply is required. With built-in reverse polarity protection and support for both in-vehicle and out-of-vehicle testing, the BM550 provides a practical solution for checking batteries in cars, trucks, SUVs, motorcycles, ATVs, boats, and other compatible applications.

Estimated delivery: US stock 2–7 business days; other warehouses 7–30 business days. Shipping details

30-day returns: For non-defective returns, tools must be unopened, unused and not activated or registered, with original packaging and all included items. Contact us before returning. Eligibility and defect support

  • Delivery estimates
  • 30-day returns
  • 1-year seller warranty
  • 6V / 12V / 24V Battery Testing
  • 100–2000 CCA Wide Testing Range
  • 2Ah–220Ah Battery Capacity Coverage
  • SOH & SOC Battery Condition Analysis
  • CCA, Voltage & Internal Resistance Testing
  • Fast Conductance-Based Battery Analysis
  • Up to 99.5% Testing Accuracy
  • Good / Normal / Poor Battery Status Indication
  • Supports Flooded, AGM, EFB & GEL Batteries
  • 1.8-Inch Clear Display
  • Plug-and-Play Operation
  • Reverse Polarity Protection
  • In-Vehicle & Out-of-Vehicle Testing
  • No External Power Supply Required
  • Built for Cars, Trucks, Motorcycles, ATVs & Boats

Learn more

What types of batteries can the KINGBOLEN BM550 test?

The KINGBOLEN BM550 supports 6V, 12V, and 24V lead-acid batteries, including: Lead-Acid Batteries<br>AGM Flat Plate Batteries<br>AGM Spiral Batteries<br>EFB Batteries<br>GEL Batteries It is suitable for many automotive applications, including cars, trucks, SUVs, motorcycles, boats, and other vehicles using compatible lead-acid batteries.

Can the KINGBOLEN BM550 test electric vehicle (EV) batteries?

No. The KINGBOLEN BM550 is designed for traditional lead-acid batteries only and does not support electric vehicle (EV) or new energy vehicle battery packs.

What battery information can the BM550 measure?

The BM550 battery tester provides important battery performance data, including: Battery Voltage<br>Cold Cranking Amps (CCA)<br>State of Health (SOH)<br>State of Charge (SOC)<br>Internal Resistance These results help users understand the current condition and performance of their battery.

How long does it take to test a battery with the BM550?

The KINGBOLEN BM550 provides battery test results within seconds. Simply connect the clamps to the battery terminals, and the tester will automatically begin analyzing the battery condition.

Can I test a battery while it is still installed in my vehicle?

Yes. The BM550 supports both in-vehicle and out-of-vehicle battery testing. You can test a battery directly in your vehicle or after removing it for inspection.

How accurate is the KINGBOLEN BM550 battery tester?

The BM550 uses advanced conductance testing technology and a built-in intelligent microprocessor to provide reliable battery measurements. The testing accuracy can reach up to 99.5% under proper testing conditions.

Do I need an external power source to use the BM550?

No. The KINGBOLEN BM550 is a plug-and-play battery tester. Simply connect the clamps to the battery terminals, and the device will power on automatically for testing.

What should I do if the screen flickers during testing?

If the screen flickers, check that the battery clamps are securely connected to the correct battery terminals. Poor contact or an improper connection may affect the testing process.

Does the BM550 have reverse polarity protection?

Yes. The BM550 features reverse connection protection. If the positive and negative clamps are accidentally connected incorrectly, the tester will not operate, helping protect the device from potential damage.

Who is the KINGBOLEN BM550 battery tester designed for?

The BM550 is suitable for: DIY car owners<br>Vehicle maintenance enthusiasts<br>Automotive repair shops<br>Garages<br>Battery service professionals It provides a simple way to check battery condition without requiring complicated equipment.
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One Tester for 6V, 12V & 24V Batteries

Cover more battery applications with a single compact tester. The BM550 supports 6V, 12V, and 24V lead-acid batteries, allowing users to handle battery checks across a broader range of vehicles and equipment without switching between multiple testing tools.

Its wide compatibility makes it suitable for cars, SUVs, trucks, motorcycles, ATVs, boats, and other applications equipped with compatible lead-acid batteries. Simply select the correct battery voltage before testing and begin the battery analysis.

See the Complete Battery Condition at a Glance

Go beyond a simple voltage reading. BM550 analyzes the main parameters that define real battery condition, including SOH, SOC, CCA, voltage, and internal resistance.

SOH (State of Health) helps evaluate battery aging and remaining condition, while SOC (State of Charge) indicates the current charge level. CCA provides insight into cold-starting capability, and internal resistance helps reveal changes inside the battery that may affect performance.

Together, these readings provide a clearer picture of whether the battery is still performing properly or may require further inspection or replacement.

100–2000 CCA & 2Ah–220Ah Wide Testing Range

From smaller powersport batteries to larger automotive batteries, BM550 offers a broad testing range to cover common everyday applications.

It supports 100–2000 CCA and battery capacities from 2Ah to 220Ah, giving users the flexibility to test batteries used across different vehicle categories while maintaining one simple testing workflow.

For battery service shops and users who regularly work with different vehicles, this wider range reduces the need for multiple dedicated battery testers.

Compatible with Common Lead-Acid Battery Types

BM550 is designed for commonly used automotive lead-acid battery technologies, including:

Regular Flooded Batteries AGM Flat Plate Batteries AGM Spiral Batteries EFB Batteries GEL Batteries

Whether the battery is installed in the vehicle or removed for inspection, BM550 provides a convenient way to evaluate its condition before maintenance or replacement.

Note: BM550 is intended for traditional lead-acid batteries and is not designed to test high-voltage EV or new-energy vehicle battery packs.

Fast Results with Conductance Testing Technology

Spend less time waiting for battery results. BM550 uses conductance-based battery testing technology together with a built-in intelligent microprocessor to quickly evaluate battery condition.

Testing can be completed within seconds, with accuracy reaching up to 99.5% under proper testing conditions. This makes routine battery inspections faster while providing the information needed to identify weak or aging batteries before they lead to starting problems.

Good, Normal or Poor — Results You Can Understand

Battery data should lead to a clear decision. BM550 simplifies its analysis with an easy-to-read battery status result:

Good — The battery is in good condition and ready for continued use. Normal — The battery remains usable, but its condition should continue to be monitored. Poor — Battery condition has deteriorated and replacement should be considered.

This simple status indication makes the tester practical not only for technicians, but also for vehicle owners who want a quick answer without interpreting complex battery data.

Plug In, Test, Get the Result

BM550 is designed for straightforward operation with no complicated setup or separate power source.

Connect the red and black clamps securely to the battery terminals, select the correct battery voltage and CCA value, and start the test. The tester is powered directly by the battery being checked, so there is no need to charge the device or install separate batteries before use.

Battery status and measurement data are displayed directly on the built-in screen, making routine battery checks easy to complete at home, in the garage, or in a repair shop.

Reverse Polarity Protection for Safer Testing

Accidental clamp reversal can happen, especially during fast workshop checks. BM550 includes reverse polarity protection to help protect the tester during incorrect positive and negative terminal connections.

If the clamps are connected in reverse, the device will not proceed with the normal test, helping reduce the risk of damage to the tester's internal circuit.

Combined with its plug-and-play design, the protection system makes routine battery testing safer and easier for both experienced technicians and first-time users.

Clear 1.8-Inch Display for Fast Reading

View essential battery information directly on the tester with its 1.8-inch display. Key values such as battery voltage selection, SOH, SOC, CCA, internal resistance, voltage, and battery status are organized on one screen for quick reading.

Physical navigation buttons keep operation simple even when working with gloves, while the compact handheld design makes the tester easy to keep in a toolbox or carry between vehicles.


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