Fluke BT520 Battery Analyser



  • Upgraded version of the BT510
  • Tests resistance, battery voltage (AC/DC), ripple voltage and frequency
  • Comprehensive logging - the BT510 automatically captures data and stores it in its memory
  • Optimised user interface with guided setup and audio/visual feedback cues
More Information
Warranty1 year
Price MatchYes

Fluke BT520 Battery Analyser

The BT520 is an improved version of Fluke's BT510 battery analyser which comes with additional functionality and additional accessories.

Made for use with stationary and battery backup systems of all types, the BT520 allows the user to see what's happening inside a battery and can test voltage, resistance and ripple voltage with a high degree of accuracy. By using the included intelligent test probe a sequence measurement mode can also be used for automatic or manual sequence testing of battery strings.

This Fluke battery analyser is the first model in the series to come with the intelligent test probe, an accessory that includes its own integrated LCD display, built-in torch, verbal audio feedback and even has an integrated save button for quick and easy storage to the analyser's memory.

When testing, the BT520 makes configuring testing procedures significantly easier by guiding the user through how to configure the test. It also includes around 999 record internal memory and is fully downloadable to PC for further interaction with testing data using Fluke's included software package.

Fluke BT510 Features:

  • Battery Voltage – During the internal resistance test, Fluke Battery Analyzers also measure the voltage of the battery under test
  • Discharge Volts – The Discharge mode collects the voltage of each battery multiple times at a user defined interval during a discharge or load test. Users can calculate the time a battery takes to drop to the cut-off voltage and use this time to determine the capacity loss of the battery
  • Ripple Voltage Test – Measures unwanted residual ac component of the rectified voltage in dc charging and inverter circuits. Allows users to test ac components in dc charging circuits and find one of the root causes of battery deterioration
  • Meter and Sequence Modes – The Meter mode is used for a quick test or troubleshooting. In this mode you can save and read the readings in a measurement or time sequence. The Sequence mode is for maintenance tasks with multiple power systems and battery strings. Before a task starts, users can configure a profile for the task for data management and report generation
  • Threshold and Warning – Users can configure a maximum of 10 sets of thresholds and receive a Pass/ Warning/ Fail indication after each measurement
  • Intercell Strap Resistance Test and Data Management – Measures the resistance of the intercell connection between batteries in a string. Once the measurements are completed Fluke Battery Management Software version 1.0.69 can now report the strap resistance for a battery string or historical data over time.
  • AutoHold – When AutoHold is turned on, a reading is captured when it remains stable for 1 second. The reading is then released when a new measurement starts
  • AutoSave – When AutoSave is turned on, measured values are saved to internal memory automatically after an AutoHold reading is captured
  • Fluke Battery Management Software – Easily import data from the Product to a PC. The measurement data and battery profile information is stored and archived with the Management Software and can be used for comparison and trend analysis. All measurement data, battery profile and analysis information can be used to easily generate reports
  • Comprehensive logging – All measured values are automatically captured during testing and can be reviewed on the instrument before downloading for on the-go analysis
  • Optimized user interface – Quick, guided setup ensures you're capturing the right data every time
  • Battery life – 7.4 V 3000 mAh lithium-ion battery for more than eight hours continuous operation.
  • USB port – For fast data download to supplied data analysis and report management application software.
  • Highest safety rating in the industry – CAT III 600 V, 1000 V dc max. rated for safe measurements all around the battery power supply equipment.

Fluke BT520 Features: (Designed for measuring batteries in cabinets and hard to reach places)

  • All of the above plus
  • BTL20 Interactive Test Probe set, with long and short probe extenders and built-in LCD display and speaker for visual and audio feedback
  • Large soft carry case

Fluke BT521 Features: (Designed for users who need to incorporate temperature measuring)

  • All of the above plus
  • BTL21 Intelligent Test Probes with long and short extenders, built-in LCD display and speaker for visual and audio feedback and integrated infrared temperature sensor for taking temperature measurements on the negative battery post with every test
  • Wireless capability works with Fluke Battery Analyze mobile app (Fluke BA Mobile)2
  • View profile and associated test results from the Battery Analyzer
  • Send out the profile and test results via Email with (.csv) data format

1 BTL20 not included with the Fluke BT-521
2 Not currently compatible with Fluke Connect app

Voltage and Resistance Thresholds

Fluke Battery Analyzers allow you to quickly and easily define upper and lower measurement thresholds or tolerance ranges. During the testing process, measured values are automatically compared to the predefined threshold levels producing a PASS, FAIL or WARN indication after each measurement. A maximum of 10 sets of thresholds can be stored and threshold indications are determined based on the following criterion:

> Voltage Lower< Voltage Lower< Reference> Reference and
< Reference x
(1+Warning %)
Reference x (1+Fail)


Fluke Battery Management Software

Fluke Battery Management Software allows you to quickly and easily import data from the battery analyzer to a PC. The measurement data and battery profile information is stored and archived with the Management Software and can be used compare results, switch results between conductance and resistance readings and perform trend analysis. All measurement data, battery profile and analysis information can be used to easily generate reports.

  • Quick view saved readings
  • Profile management
  • Histogram of a battery string with end user defined threshold
  • Historical trend data of batteries
  • Multiple rounds of discharge voltage
  • Quick Report Generation
  • Upgrade Fluke Battery Analyzer firmware
  • Switch measurement results between conductance and resistance readings

Fluke Battery Analyze mobile app

The BT521 offers wireless communication for data download and remote display while measuring via the dedicated Fluke Battery Analyzer mobile app (note: the Fluke BT521 is not currently Fluke Connect compatible). Using the Fluke Battery Analyze mobile app you can:

  • Browse profile
  • Review sequence testing data
  • E-mail sequence testing data


Battery resistance13 mΩ0.001 mΩ1% + 8
30 mΩ0.01 mΩ0.8% + 6
300 mΩ0.1 mΩ0.8% + 6
3000 mΩ1 mΩ0.8% + 6
Vdc6 V0.001 v0.09% + 5
60 V0.01 v0.09% + 5
600 V0.1 v0.09% + 5
1000 v1V0.09% + 5  
Vac (45 Hz to 500 Hz with 800 Hz filter)600 v0.1 v2% + 10
Frequency (displayed with Vac and Aac)2500 Hz0.1 Hz0.5% + 8
AC voltage ripple (20KHz Max)600 mV0.1 mV3% + 20
6000 mV1 mV3% + 10
Adc/Aac (with accessory Fluke i410)400 A1 A3.5% + 2  
Temperature0°C to 60°C1°C2°C (4 °F)  
Meter mode999 records for each measurement position with time stamp
Sequence modeUp to 100 profiles and 100 profile templates (Each profile stores up to 450 batteries) with time stamp
1 The measurement is based on ac injection method. The injected source signal is < 100 mA, 1 kHz.
2 Trigger level VAC: 10 mV, Aac: 10 A


Measurement ModesBT510BT520BT521
Resistance (mΩ)
Battery voltage
Voltage dc
Voltage ac and frequency (Hz)
Ripple volt
Temperature of negative battery post  
DC and ac current (and frequency)  
DMM mode
Sequence mode
Discharge measurement mode
Automatic measurement save
Wireless commumcation  
Memory view


What's Included?

  • BT520 Battery analyzer
  • 4-wire test pin (set)
  • BTL10 Basic Test Lead (set)
  • TL175 TwistGuard™ Test Leads with adapter
  • BP500 lithium-ion battery
  • BC500 AC charger
  • Mini-USB cable
  • Shoulder strap
  • Belt strap
  • Magnetic hanging strap
  • FlukeView Battery Management Software
  • Soft carrying case
  • Spare fuses (2)
  • Zero Ohm Calibration Resistor
  • BTL20 Intelligent Test Probe Set, with extender (no temperature sensor)
  • Battery tags
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