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Highlights
◉ 2000A CCA Precision Tester for 12V/24V batteries
◉ Tests All Major Battery Types: AGM, GEL, EFB, Flooded
◉ One-Step Health Check: Instant SoH, CCA & internal resistance in seconds
◉ Real Cranking & Charging Analysis
◉ 6 Global Standards Supported: CCA/IEC/EN/DIN/JIS/GB
◉ In-Vehicle Testing: No need to disconnect the battery
◉ 2.4" Color Screen with Day/Night Mode
◉ Safe & Smart: Reverse polarity & overvoltage protection built-in
The FNIRSI BTM-24 Battery Tester is a compact, professional tool for fast and accurate battery health checks. It measures voltage, internal resistance, CCA, startup performance, load response, and charging system status—all in seconds. Supporting 12V/24V lead-acid, AGM, and lithium batteries with six international standards (CCA, IEC, EN, DIN, JIS, GB), it's perfect for automotive, industrial, and telecom use. The 2.4" color screen delivers clear, real-time results—no guesswork, just reliable diagnostics.
Features
- Supports 12V & 24V Systems: Compatible with a wide range of vehicles and equipment.
- Multi-Battery Type Compatibility: Works with AGM (flat plate & spiral), GEL, EFB, and standard flooded lead-acid batteries.
- 6 International Battery Standards: CCA, IEC, EN, DIN, JIS, and GB for global accuracy.
- Comprehensive Diagnostics: Measures voltage, internal resistance, State of Charge (SoC), State of Health (SoH), CCA rating, and load performance.
- Two Testing Modes: In-vehicle (on-car) or out-of-vehicle (bench) testing—no battery removal needed.
- One-Tap Cranking Test: Captures real-time cranking voltage drop during engine start for instant starter system insight.
- Real-Time Internal Resistance Testing: Non-destructive method to assess battery aging and health in seconds.
- Dynamic Charging System Analysis: Monitors minimum, maximum, and fluctuating voltage under real-world alternator loads.
- Waveform Display: Visualizes voltage trends and load changes for intuitive diagnostics.
- 2.4" Full-Color TFT Screen: With switchable Day/Night (black/white) modes for optimal visibility in any lighting.
- Insulated Heavy-Duty Clamps: Ensure safe, secure, spark-free connections.
- Built-in Safety Protections: Reverse polarity alert and overvoltage protection safeguard both user and battery.
- All-in-One Design: Compact, portable, and ready for automotive, marine, industrial, and telecom applications.
- Instant Health Report: After one test, get clear pass/warn/fail status, life estimate, and actionable recommendations.
Specifications
Basic Parameters:
Voltage Range
12V / 24V
CCA Test Range
0 – 2000 CCA (Selectable)
Screen Material
2.4-inch Color Screen
Language
Chinese, English
Product Size
80.52*155.76*28.15mm
Bare Weight
≈479g
Battery Test Parameters:
Battery life is low
SOH: 0-60%
Status: ❌Bad
Status: ❌Bad
Battery life is average
SOH: 60-80%
Status: ⚠Attention
Status: ⚠Attention
Battery life is good
SOH: 80-100%
Status: ✔Good
Status: ✔Good
※ Note: Before testing, turn off the engine and turn the key to the OFF position while the car is running.
Startup Test Parameters:
No Action Needed
Cranking Voltage: ≥10.2V
Status: ✔Good
Status: ✔Good
Monitor Battery Health
Cranking Voltage: 9.6~10.2V
Status: ⚠Weak
Status: ⚠Weak
Check Wiring / Charging System
Cranking Voltage: <9.6V
Status: ❌Low
Status: ❌Low
※ Note: Before testing, turn off the engine and turn the key to the OFF position while the car is running.
Load Test Parameters:
Battery & Charging OK
Min Voltage: >13.4V (24V system >25.6V)
Status: Normal
Status: Normal
Check Alternator belt / Wiring for Issues
Min Voltage: >12.8V (24V system >25.6V)
Status: Low Voltage
Status: Low Voltage
※Note: Before the test, start the car, select the load test mode, press the OK button, increase the speed to 2000~2500, and then press the OK button to obtain the measurement results.
Charging Test Parameters:
Overvoltage - Check Regulator
Max Voltage: >15.0V (24V system >30.0V)
Undervoltage - Check Battery & Alternator Wiring
Max Voltage: >13.3V (24V system >26.6V)
Normal - Alternator Excellent
Max Voltage: >13.9V (24V system >27.8V)
Normal - Alternator Good
Max Voltage: >13.7V (24V system >27.4V)
Normal - Alternator Normal
Max Voltage: >13.5V (24V system >27.0V)
Normal - Check Alternator Condition
Max Voltage: >13.3V (24V system >26.6V)
Displacement Vehicle Test Parameters:
Engine Displacement 1200~1600 CC
Reference CCA Value: 350
Engine Displacement 1600~2000 CC
Reference CCA Value: 500
Engine Displacement 2000~3000 CC
Reference CCA Value: 650
Engine Displacement 3000 CC Up
Reference CCA Value: 750
Package List:
◉ BTM-24 Host *1
◉ User Manual *1
◉ Data Cable *1
◉ Storage Bag *1
◉ User Manual *1
◉ Data Cable *1
◉ Storage Bag *1
Package List:
◉ BTM-24 Host *1
◉ User Manual *1
◉ Data Cable *1
◉ Storage Bag *1
◉ User Manual *1
◉ Data Cable *1
◉ Storage Bag *1
Using Environment and Precautions
The device should be stored in a soft case, and the operating environment should be at a temperature of -5~40℃, and the relative humidity should not exceed 80%.
The device should be stored in a clean and dry place to avoid moisture, mold, heavy pressure, mechanical damage,humidity and direct sunlight.
Avoid using in the rain or fog, avoid dropping or shocking.
When the screen on the LCD does not light up, it indicates that the voltage is too low, and it needs to be charged in time.
Copyrights
The product specifications are subject to change without notice, allfinal interpretation rights were reserved by FNIRSI Technology Co., Ltd, All trademarks, product images, technical parameters are properties of FNIRSI Technology Co.. Ltd. All rights reserved.
Warranty
30-Day return and refund guarantee (Refer to our Refund Policy), 2-year warranty (only available for orders purchased directly from fnirsi.com), lifetime technique support by FNIRSI.
Please feel free to reach us with any concerns:
Email: service@fnirsi.com / info@fnirsi.com
We strive to reply to you within 24 hours.
FNIRSI has started researching and development manufacturer of quality optical products including Golf rangefinder, laser,measure device and binoculars since 2016.
Focus on the development,researching, and manufacturing for over 8 years.
We are committed to delivering premium products and exceptional customer service, striving to be your most reliable and intelligent assistant.
At Fnirsi, we are committed to providing our customers with the best value for their purchases. To ensure you always get the best price, we offer a 30-day price guarantee on all products purchased directly from fnirsi.com. This policy aims to give you confidence and peace of mind when shopping with us.
What is the 30-Day Price Guarantee?
Our 30-day price guarantee means that if you purchase a product from fnirsi.com and the price of that product drops within 30 days of your purchase date, you are eligible for a refund of the price difference of the products. (Prices are based on USD. No refunds will be given for price changes in other currencies due to exchange rate fluctuations.)
How Does the Price Guarantee Apply?
- Eligibility: The price guarantee applies only to purchases made on fnirsi.com. Products purchased from other retailers or third-party sellers are not eligible.
- Timeframe: The price drop must occur within 30 days of your original purchase date.
- Product Match: The price guarantee applies to the same product (identical model, specifications, and condition).
How to Apply for a Price Difference Refund
If you notice that the price of a product you purchased from fnirsi.com has dropped within 30 days, follow these steps to apply for a refund of the price difference:
- Documentation: Prepare your order number and proof of the price drop (such as a screenshot and link to the product page showing the reduced price).
- Contact Us: Reach out to our customer support team at info@fnirsi.com .Include your order number, proof of the price drop, and a brief explanation of your request.
- Verification: Our team will verify the price drop and your purchase details.
- Refund Process: Once verified, we will process the refund for the price difference to your original method of payment. It typically takes 1-3 business days for you to receive the refund.
At Fnirsi, we strive to provide our customers with high-quality products and exceptional customer service. Our 30-day price guarantee is just one of the ways we ensure you get the best value for your investment. Shop confidently with Fnirsi, knowing that you are always getting the best deal available.
Thank you for choosing Fnirsi. If you have any questions or need further assistance, please do not hesitate to contact our customer support team at info@fnirsi.com.
m
The battery tester is verry basic, but good enough to get a quick reading of the battery life. The dutycycle works fine also
N
Great quality device and works as described. Well packed and comes with a case.
Delivery from Hongkong to UK took 2 weeks, hence 4 star.
FNIRSI product look quality products will buy their other devices.
S
OK!!!
E
I appreciate doing business with this company. However, check the printing of advertising. I like the manner in which my item is wrapped & mailed to ensure that the box can not be so easily opened during the delivery process. Also delivery time is fast. Keep up the good work.
L
Super ierīce mērīt akumulatorus. Paldies ražotājiem, inženieriem.
M
Well build and sturdy. Easy to use and clear display. The buttons are abit stiff and the settings dont seem to have option to close sound
T
Ideal for quick checks of automotive batteries and charging circuits. Seems accurate and gives quick results.
I
Super 👍👍👍
D
Great
A
simple, effiency, portable, intuitive
u
Good!
A
good service, good delivery. Battery tester does the job ok. Display could be bigger and it is a hard to read in sunlight
Á
FNIRSI® BTM-24 2000A CCA Multi-Function 12V/24V Car Battery Tester
K
Your service and product exceed expectations. This is another piece of equipment delivered promptly before the promised delivery date and of high quality considering the price!
S
Received on time and is very nice tool. Will purchase more in the future.
A
Great, recommend to all
L
They do not respond to emails on how to get this thing back to them. It doesn't work is very, very cheap. Not worth the money stay away. Actually, since it has bad customer service.
A
Perfect service
P
Works well on every battery I tried. Worth the money.
D
FNIRSI® BTM-24 2000A CCA Multi-Function 12V/24V Car Battery Tester
N
Awesome tester
A
As described and works well for what it is.
R
Can't read display in bright light!
Hello Richard Nicolich, you can improve the device's visibility in bright light by changing the UI mode and adjusting the brightness.
V
Tested more than 60 batteries 12V 7-9AH without any issue and very fast response.
I would like to see a pass /fail indication based on the battery setup. I’d like to have more detailed battery setup so the results could be more accurate
A
One time i purchased a night vision monocular from an outdoor/adventure store and paid over 200.00 euros for it.I saw Fnirsis NVS-20 NIGHT VISION MONOCULAR ONLINE.I purchased it and found it was superior to the first one i purchased.I ended up buying 2 -NVS -40 4K NIGHT VISION BINOCULARS THEY WERE SO GOOD.AS A TRUE FOLLOWER OF GREAT ELECTRONICS I PURCHASED THE TDM-120P THERMAL IMAGING MULTIMETER.THIS ALSO PROVED ITSELF AS QUALITY ELECTRONICS AND A REALLY GREAT PRICE.5 STAR AS ALWAYS.
A
Easily identifies Starter batteries that are in the verge of failure. Also confirms the health Status of good batteries. Good UI Design, can recommend the tester
P
5% Boa qualidade
B
Praktikus eszközök!
R
Looks great
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