Your complete Solution for Reliable Vehicle Diagnostics

Take control of your vehicle's electrical health with the BT-400 Battery and Charging System Tester — the ultimate tool for precise diagnostics and dependable performance. Whether you're a seasoned mechanic, an automotive technician, or a car enthusiast, the BT-400 empowers you to quickly and accurately test batteries, cranking ability, and charging systems — all in one compact and intuitive device.

Powerful Testing, Simple Operation

Designed for 12V battery systems and both 12V/24V cranking and charging systems, the BT-400 provides comprehensive electrical system testing in a single, easy-to-use unit. Its advanced features and ergonomic design make it ideal for both in-shop diagnostics and on-the-go testing.

No more guesswork — just fast, accurate, and reliable results when you need them most.

Why Choose the BT-400?

• Comprehensive System Testing
  Evaluate your battery condition , cranking performance , and charging system health with one device. The BT-400 supports testing for 12V batteries, 12V cranking batteries, and both 12V and 24V charging systems. It also features internal resistance testing to further assess battery efficiency.

• Cranking Battery Analysis
  Get precise measurements for your battery's cranking ability. This is essential for diagnosing issues that may prevent your vehicle from starting — especially in colder climates or high-demand conditions.

• In-Car Testing Capability
  The BT-400 allows you to test the battery and charging system directly within the vehicle , streamlining the diagnostic process and saving valuable time.

• Smart Temperature Compensation
  With automatic temperature adjustment for environments above or below 0ºC (32ºF) , the BT-400 ensures that your test results are as accurate as possible, regardless of weather conditions.

• User-Friendly LCD Display
  Equipped with a 4-line LCD screen and adjustable backlight brightness , the BT-400 provides clear and easy-to-read data even in low-light or bright outdoor settings.

• Mistake-Proof Navigation
  Accidentally selected the wrong setting? No problem. Just hold the Enter key to return to the previous menu, making the BT-400 one of the most forgiving and intuitive testers on the market.

• Compact and Durable Design
  The BT-400 is crafted with a sleek, compact form factor and features a protective cover , offering portability and protection for both indoor and outdoor testing applications.

• Multilingual Support
  With 10 built-in languages , including English, French, Spanish, German, Italian, Portuguese, Dutch, Russian, Turkish, and Czech, the BT-400 is ready to support users across the globe.

BT-400 Specifications at a Glance

• Model Number: BT-400

• Applications:

  • 12V battery testing

  • 12V Start-Stop battery testing

  • 12V & 24V cranking/charging system diagnostics

  • Internal Resistance (IR) test

• Display: 4-line LCD with adjustable brightness

• Battery Compatibility: Flooded, VRLA/GEL, AGM Flat, AGM Spiral, EFB

• Supported Battery Standards: CCA/SAE, EN, JIS, DIN, IEC, CA/MCA

• Testing Range:

  • Operating CCA: 40 ~ 2,000 CCA (SAE)

  • Voltage Range: 8V ~ 31.5V

• Dimensions: 140mm (L) x 100mm (W) x 30mm (H)

• Languages: English, French, Spanish, German, Italian, Portuguese, Dutch, Russian, Turkish, Czech

Ready for Any Workshop or Toolbox

Whether you're performing routine diagnostics, troubleshooting a starting issue, or verifying charging system output, the BT-400 is your dependable diagnostic partner. With high precision, easy operation, and rugged design, it's the tool every automotive professional and enthusiast should have.

Looking for Even More Power?

Check out our BT-900 model for enhanced diagnostic features and extended capabilities.

Optimize your vehicle's electrical performance with confidence. Choose the BT-400 today and experience unmatched reliability and convenience.