FNIRSI BTM-24 is a practical diagnostic tool that lets you verify the condition of the car battery and the charging system with a single test. It measures voltage, cranking current up to 2000 A, SOC, SOH, internal resistance, and helps quickly determine whether the issue is in the battery, alternator, or wiring.
Forget guessing when dealing with weak starts or unstable electronics. The FNIRSI BTM-24 tester provides a clear rating (GOOD / CHARGE / BAD) and also displays precise values so you can decide whether to recharge the battery, replace it, or look for a charging fault.
Thanks to a non-destructive test method (no load applied to the battery), measuring is safe and fast. The One-Tap Cranking Test tracks voltage drop during starting in real time and immediately shows whether cranking is within normal limits. When checking charging, you can see min./max. and dynamic charging voltage as well as a voltage curve graph for easy assessment of alternator and regulation condition.
Main advantages and uses:
- Supports both 12 V and 24 V batteries (measurement range 6–30 V)
- Compatible with CCA, EN, DIN, IEC, JIS, GB standards
- Battery types: AGM (flat and spiral), EFB, GEL, conventional lead-acid (flooded)
- Clear 2.4" color TFT display with day/night mode
- Safe insulated clamps and protections: reverse polarity, overvoltage, short circuit
- Suitable for cars, motorcycles, ATVs, boats, vans, and fleet operations
Specifications
- Manufacturer
- FNIRSI
- Model
- BTM-24
- Device type
- Multifunction battery and charging system tester
- Supported battery voltage
- 12 V / 24 V
- Voltage measurement range
- 6–30 V
- Testable cranking current range
- up to 2000 A
- Supported battery standards
- CCA / EN / DIN / IEC / JIS / GB
- Supported battery types
- AGM (flat plate, spiral), EFB, GEL, lead-acid (flooded)
- Diagnostic tests
- SOH (state of health), SOC (state of charge), internal resistance, cranking test, load test, charging test
- Testing method
- Non-destructive (no battery load)
- Test modes
- In-vehicle / out-of-vehicle
- Display
- 2.4" color TFT display
- Display modes
- Day and night mode
- Data display
- Numeric values + real-time voltage graphs
- Controls
- Directional buttons + OK button
- Protections
- Reverse polarity, overvoltage, short circuit
- Measurement cable length
- approximately 61 cm
- Design
- Integrated cable, fold-out stand, hanging hole
- Housing material
- Impact-resistant plastic
- Menu language
- English / Chinese
- Device dimensions
- 80.5 × 155.8 × 28.2 mm
- Device weight
- approximately 479 g
- Applications
- Passenger cars, motorcycles, ATVs, boats, vans and trucks, fleets, golf carts
- Package contents
- FNIRSI BTM-24 tester, measurement leads with insulated clamps, user manual, data cable, case
