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FLUKE BT521 500 series battery analyser with intelligent measuring probe set, with extension and temperature sensor - 4489996

Supplier number: FLUKE 4489996 | EAN 0095969727266
6,574.44 tax incl.
€5,433.42 excl. VAT (incl. all environmental contributions)
On order: delivered from 08/10/2026

  • Ordered before 20:00 - delivered as of 08/10/2026
  • Free shipping
  • Delivery by DHL

Fluke Seasonal Promotion 2026

Receive a free Fluke instrument when you purchase Fluke products! Valid from 01.09.2026 to 31.12.2026.

How does it work?

  • Purchase Fluke products during the promotion period.
  • Spend more than €100 excl. VAT? You will earn points based on the value of your purchase: €1 = 1 point.
  • Redeem your points for a free gift or save them for a higher-value gift.
  • Register your purchase via the Fluke registration page.
  • Fluke promotions are recognisable by the promotion label on the product page. Click the label to discover all available Fluke promotions.

Choose your free gift

The more you spend, the greater the reward. See below which free Fluke instruments you can choose based on the number of points you have earned.

Fluke Promotion 2026 - Receive free Fluke instruments



€6,574.44
tax incl.

Product information

Scope of delivery

  • Battery analyser
  • 4-wire measuring pin (set)
  • BTL10, basic measuring lead (set)
  • TL175 TwistGuard measuring leads with adapter
  • BTL21 intelligent measuring probe set, with extension and temperature sensor
  • i410, AC/DC current clamp
  • BP500 lithium-ion battery
  • BC500 AC charger
  • mini-USB cable
  • Shoulder strap
  • Carrying strap
  • Magnetic suspension strap
  • FlukeView battery management system
  • Soft carrying case
  • Spare fuses (2)
  • Battery labels
  • Zero-ohm calibration resistor

Product description

The ideal gauge for maintenance, troubleshooting and to measure performance of individual stationary batteries and battery banks used in critical battery back-up applications

  • Key measurements: Internal battery resistance, direct and alternating voltage, direct and alternating current strength, ripple voltage, frequency and temperature
  • Sequence measurement mode: Automatic or manual sequential testing of battery series with automatic storage of measurements including voltage, resistance and temperature (with intelligent measuring probe BTL21), eliminating the need to press a button each time a measurement needs to be stored
  • Comprehensive recording: All measured values are automatically recorded during measurement and can be viewed on the instrument before downloading for analysis on the go.

Reduced measurement complexity, simplified workflow and an intuitive user interface provide a new level of ease of use when measuring batteries.

  • The ideal measurement tool for maintenance, troubleshooting and to measure performance of individual stationary batteries and battery banks used in critical battery back-up applications
  • Intuitive user interface, compact design and robust construction ensure optimal performance, measurement results and reliability
  • Includes a wide range of battery measurement functions, ranging from DC voltage and resistance measurements to full condition measurements using automated sequence function measurements and the infrared temperature measurement system integrated into the measurement probe
  • Designed for measurements on all types of stationary batteries.

Threshold values for voltage and resistance

Fluke battery analysers allow you to quickly and easily define upper and lower threshold values and tolerance ranges. During the testing process, measured values are automatically compared with the predefined thresholds and you get a PASS (good), FAIL (error) or WARN (warning) after each measurement.

Fluke battery management software

Fluke battery management software lets you easily and quickly import data from the battery analyser to a PC. The measurement data and battery profile information are stored and archived with the Management Software and can be used to compare results, switch results between conductivity and resistivity values and perform trend analysis. All measurement data, battery profile and analysis information can be used to easily generate reports.

  • Quick display of stored measurement values
  • Profile management
  • Histogram of a battery series with end-user-defined threshold value
  • Historical trend data of batteries
  • Multiple rounds of discharge voltage
  • Quickly generate reports
  • Upgrade firmware of Fluke Battery Analyzer
  • Swap readings 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 currently not compatible with Fluke Connect). With the Fluke Battery Analyze mobile app, you can

  • View profiles
  • View Sequence test data
  • Email sequence test data

Main features of the Fluke BT521: (Designed for users who need built-in temperature measurements)

  • Battery voltage: While measuring internal resistance, Fluke Battery Analyzers also measure the voltage of the battery under testDischarge voltage
  • : In Discharge mode, the voltage of each battery is measured multiple times at user-defined intervals during a discharge or load test. Users can calculate the length of time after which a battery reaches the shutdown voltage and use this time to calculate the battery's capacity lossRipple voltage measurement
  • : Measures unwanted residual AC component of the rectified voltage in DC charging and inverter circuits. Allows users to measure AC components in DC charging circuits and find one of the causes of battery deteriorationModes
  • Meter (Meter) and Sequence (Sequence): Meter mode is used for quick measurement or fault finding. In this mode, you can store and read readings in a measurement or time sequence. Sequence mode is intended for maintenance tasks in multiple power supply systems and battery series. Before starting a task, users can configure a profile for the task, for managing data and creating reportsThreshold
  • and Warning: Users can configure up to 10 sets of thresholds and get a good/error/warning indication after each measurementWeakness Test
  • Inter-Cell Connections and Data Management: Measures the resistance of the inter-cell connection between batteries in a series.
  • AutoHold: When AutoHold is enabled, a reading is captured when it remains stable for 1 second. The readout is released when a new measurement startsAutoSave
  • : When AutoSave is enabled, measurement values are automatically saved to the product's internal memory after AutoHoldFluke
  • Battery management software: Easily import data from the product to a PC. With the management software, measurement data and battery profile information are saved and archived after which they can be used for comparison and trend analysis. All measurement data and all battery profile information and analysis can be used for easy report creationComprehensive
  • recording: All measured values are automatically captured during recording and can be reviewed on the instrument before downloading for analysis on the go.
  • Optimised user interface:Quick, guided setup ensures you always capture the right
  • dataBattery
  • life
  • :7.4V 3000mAh lithium-ion battery for more than eight hours of continuous use.
  • USB port: For fast data download to included data analysis and report management application software.
  • Highest safety specification in the industry: specification CAT III 600V, 1000VDC max for safe measurements around battery power equipment.
  • Intelligent test probes BTL21 with long and short extensions, built-in LCD display and speaker for visual and auditory feedback and integrated temperature sensor for making temperature measurements on the negative battery pole at each measurementBTL20ANG
  • Intelligent test probe set, with long and short angled probe pin extensions (no temperature sensor)
  • View profiles and corresponding measurement results from the Battery Analyzer
  • Send profile and measurement results via e-mail in .CSV data format
  • Brand FLUKE
  • EAN 0095969727266
  • Supplier number FLUKE 4489996
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