TopDiag BT400 Multifunctional | Battery Tester
Warranty directly via AsTools
Warranty directly via AsTools
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2 years warranty on all products
2 years warranty on all products
All our products come with a 2-year factory warranty. This ensures you long-lasting quality and service.
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Easy returns
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Professional customer service
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The TopDiag BT400 is a multifunction battery tester for 12V and 24V systems that combines four functions: the battery test with starting and charging test, battery replacement with memory retention, leakage current measurement and a voltage test on the OBD2 pins. It operates within a voltage range of 8 to 30 V and measures up to 2000 CCA.
With leakage current measurement from 15 mA to 5 A, you record consumption for up to 30 minutes as a waveform. This shows when a consumer switches on while you pull fuses. When replacing the battery, you maintain the on-board voltage via the OBD2 connector and a second battery, so settings and codes are retained.
PROS
POINTS TO NOTE
Applications and functionality
The BT400 combines four functions for work on the electrical system of 12V and 24V vehicles.
Battery, starting and charging test
- Battery test: Assesses the condition and cold cranking capacity of the battery.
- Starting test: The voltage while the starter motor is cranking.
- Charging test: The charging voltage of the alternator.
Leakage current measurement
- Measuring range: 15 mA to 5 A.
- Recording: Current and progression recorded as a waveform for up to 30 minutes.
Battery replacement with memory retention
- Via OBD2: An auxiliary battery powers the on-board system via the OBD2 connector while the battery is removed.
OBD2 voltage test
- Voltage per pin: Check the voltage on the pins of the OBD2 connector before reading out.
How to use it
- Select function: Choose battery test, leakage current, memory retention or OBD2 test.
- Connecting: For the battery test, clamp to the battery; for memory retention, the auxiliary battery and the OBD2 plug.
- Measuring: Follow the steps on the screen; for leakage current, pull fuses while following the waveform.
- Reading the result: Read the measured values and the assessment on the screen.
Special functions and features
The BT400 replaces several separate measuring tools in the workshop.
- Leakage current waveform: You see when consumption changes, not just how much it is.
- Memory retention: Radio codes, seat positions and clock settings are retained when changing the battery.
- OBD2 pin voltage: Check the power supply to the diagnostic connector.
- Wide working range: 8 to 30 V, for 12V and 24V systems.
- Multilingual display: Operation via an LCD screen in multiple languages.
Package contents
- 1x TopDiag BT400 battery tester
- 1x Set of clamps and cables
- 1x Carry case
- 1x User manual
Technical specifications
General
- The brand that manufactures the tester.Brand
- Topdiag
- Whether the device tests only the battery, or also starting and charging by the alternator. A more comprehensive tester finds more causes of starting problems.Type of tester
- Battery and system tester
- Which battery voltages you can test. 12 volts is for cars, 24 volts for lorries and buses.Battery voltage
- 12 V
- 24 V
Batteries and standards
- Which types of batteries the tester can assess accurately. Modern cars with start stop often have an AGM or EFB battery.Battery types
- Lead acid
- AGM flat plate
- AGM spiral wound
- EFB
- Gel
- The standards in which you can enter the battery's cold start current. Choose the standard shown on the battery.Test standards
- CCA
- EN
- DIN
- IEC
- JIS
- SAE
- BCI
- CA
- MCA
- Between which values the tester can measure the cold cranking current. A wider range suits more types of batteries.Cold start current measuring range
- 100 to 2,000 CCA
Test functions
- Measures the condition, state of charge and cold start current of the battery. This shows whether the battery is still good or needs replacing.Battery test
- Yes
- Measures how far the voltage drops when the engine starts. This shows whether the starter motor draws too much current.Start test
- Yes
- Checks whether the alternator charges the battery properly. Useful if the battery keeps going flat.Charging system test
- Yes
- Shows the internal resistance of the battery. A high resistance indicates a worn battery.Internal resistance measurement
- Yes
Screen and controls
- Whether the tester can print the result directly on a receipt. Useful to hand to a customer.Built-in printer
- No
Use
- Protects the tester if you connect the clamps the wrong way round.Reverse polarity protection
- Yes
Dimensions and weight
- The length, width and height of the tester.Dimensions
- 125 x 70 x 22 mm
- How heavy the tester is. A light tester is easy to carry.Weight
- 230 g
- Operating voltage
- 8 to 30 V
Other specifications
- Type
- Multifunctional battery tester
- Battery types
- Regular flooded, AGM and GEL
- Features
- Battery, starting and charging test, parasitic draw, memory retention and OBD2 voltage test
- Parasitic draw
- 15 mA to 5 A, logging up to 30 minutes
- Memory retention
- Via OBD2 with an auxiliary battery
- Display
- LCD, multilingual