Cassiope BT300 12V/24V Automotive Battery Tester

Know Your Battery Before It Lets You Down

The cassiope BT300 Automotive Battery Tester helps you understand the real condition of your vehicle battery before weak starting performance turns into an unexpected breakdown.

Designed for both everyday vehicle owners and workshop use, the BT300 combines battery health analysis, cranking system testing, charging system testing and load testing in one compact handheld tool.

Simply connect the clamps to the battery terminals and follow the clear on-screen menu - no separate power supply or built-in battery is required.

Complete Battery Health Analysis

The BT300 provides key battery information including:

• State of Health (SOH)
• State of Charge (SOC)
• Battery Voltage
• Cold Cranking Amps (CCA)
• Internal Resistance
• Battery Power / Condition

Instead of relying only on battery voltage, the tester gives you a more complete picture of battery condition and starting capability.

Cranking System Test

Check how the battery performs while the engine is starting.

The BT300 records starting voltage and voltage behaviour during cranking, helping identify:

• Weak battery performance
• Low cranking voltage
• Difficult starting conditions
• Potential starting-system problems

Useful when your vehicle starts slowly or intermittently.

Charging System Test

Check whether the alternator and charging system are operating correctly.

The tester can display:

• Load charging voltage
• No-load charging voltage
• Ripple condition

This helps identify charging problems before they leave the battery undercharged.

Load Test

Monitor voltage changes under vehicle electrical load to better understand battery and charging-system performance during real operating conditions.

Wide Testing Range

The BT300 supports:

• CCA Range: 20-2000 CCA
• Battery Capacity: 10Ah-300Ah
• Voltage Range: 8-30V

It supports multiple international battery standards including:

CCA, JIS, GB, SAE, MCA, CA, DIN, IEC, EN and BCI.

Compatible Battery Types

Suitable for common automotive lead-acid battery types including:

• Regular Flooded Lead-Acid
• AGM Flat Plate
• AGM Spiral
• GEL
• EFB

This makes the BT300 suitable for a wide range of passenger and commercial vehicle applications.

Clear 2.4-Inch Colour Display

The 2.4-inch TFT colour display with 320 × 240 resolution provides easy-to-read menus, test values and result screens.

The simple button layout allows quick navigation through test functions without relying on a mobile app.

Reverse Polarity Protection

Accidentally connecting the clamps incorrectly should not immediately damage the tester.

Built-in reverse connection protection adds an extra layer of safety during everyday use.

USB Software Upgrade Support

The tester includes a USB interface for supported software and firmware updates via PC, helping keep the device up to date.

Multi-Language Interface

Supports up to 15 interface languages, including English and several major international languages.

Suitable For

Ideal for:

• Cars
• SUVs
• Bakkies
• Motorcycles
• Trucks and commercial vehicles
• DIY vehicle maintenance
• Workshops and technicians
• Fleet checks

Whether you want to check an ageing battery before a long trip or diagnose slow starting at home, the BT300 gives you useful battery information within minutes.

• 3-in-1 Vehicle System Check - Test battery condition, cranking performance and charging-system operation.
• 20-2000 CCA Testing Range - Suitable for a wide range of automotive batteries from 10Ah to 300Ah.
• Detailed Battery Analysis - Displays SOH, SOC, voltage, CCA, internal resistance and battery condition.
• 2.4" TFT Colour Screen - Clear 320 × 240 display with simple menu navigation.
• Multiple Battery Standards - Supports CCA, JIS, GB, SAE, MCA, CA, DIN, IEC, EN and BCI.
• Wide Battery Compatibility - Supports Flooded, AGM Flat, AGM Spiral, GEL and EFB batteries.
• No Built-In Battery Required - Powered directly from the battery being tested.
• Reverse Polarity Protection - Helps protect the tester from incorrect clamp connection.
• USB Upgrade Support - Firmware/software upgrade capability via compatible PC connection.
• For DIY & Professional Use - Suitable for vehicle owners, workshops and fleet maintenance.

What's in the box
1 x BT300 Battery Tester with Battery Clamps
1 x User Manual