FNIRSI BTM-24 multifunctional car battery tester

FNIRSI BTM-24 Multifunctional Car Battery Tester

The FNIRSI BTM-24 is an advanced, yet incredibly easy-to-use 12V and 24V battery tester that replaces multiple diagnostic tools. In a single measurement, you can check voltage, cranking current up to 2000A CCA, state of charge (SOC), state of health (SOH), internal resistance, and the proper operation of the alternator and charging system. This provides a quick, clear answer to the question: is the battery healthy or is it nearing the end of its life.

No more guessing – know before your battery fails

Dimming lights, starting problems, or random electronic errors are the first warning signs. FNIRSI BTM-24 eliminates the guesswork – it clearly shows whether the problem is the battery, alternator, or wiring. This helps you avoid costly blind repairs and replacement of faulty components.

Non-destructive battery health test – safe and reliable

The device uses non-destructive diagnostics, meaning there's no stress on the battery during testing. Simply select the battery standard and start the measurement with a single click. The result is presented in the form of a clear GOOD / CHARGE / BAD rating along with precise technical parameters – you know exactly what to do next.

Check engine start with one click

The One-Tap Cranking Test function records the voltage drop in real time while cranking the engine. The tester immediately informs you whether cranking is within normal limits (> 9.6V) or whether a problem is indicated. This is an indispensable tool for diagnosing weak batteries and starting system problems.

Real test of charging and alternator while driving

The BTM-24 monitors dynamic, minimum, and maximum charging voltage, showing how the system responds to changes in engine speed and load activation. A graphical voltage waveform allows you to assess the condition of the alternator, voltage regulator, and wiring at a glance—no guesswork or a service visit required.

Full battery and vehicle compatibility

The tester supports 6 battery standards: CCA, EN, DIN, IEC, JIS, and GB, as well as AGM (flat and spiral), GEL, EFB, and classic lead-acid batteries. It works in passenger cars, motorcycles, ATVs, boats, delivery vehicles, trucks, company fleets, and golf carts – both in and out of the vehicle.

Clear screen and intuitive operation for everyone

The 2.4" TFT color screen with day and night modes guarantees excellent readability in all conditions. A simple menu guides the user step by step, making the device easy to use for both mechanics, novice drivers, and used car buyers.

Maximum work safety

Rugged, insulated alligator clips with a wide grip range ensure a secure connection. Built-in reverse polarity and overvoltage protection protect the battery, vehicle electronics, and the device itself – you can test without stress or risk.

Well-thought-out design and ready-to-use kit

The FNIRSI BTM-24 features an integrated, tear-resistant cable, 61 cm terminals, a foldable stand, and a hanging hole. The kit includes a tester, instructions, a data cable, and a practical carrying case, ensuring the device is always safe, mobile, and ready to use.

Who is the FNIRSI BTM-24 for?

It's the perfect tool for mechanics, garages, DIY enthusiasts, new drivers, corporate fleets, and used car buyers. A single tester that gives you confidence, saves you money, and lets you make decisions based on facts—not assumptions.

Included:

• FNIRSI BTM-24 Battery Tester
• Test leads with insulated terminals
• User Manual
• Data Cable
• Transport case