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Fluke BT521ANG Advanced Battery Analyzer with angled test probes

Model: BT521ANG

Comes equipped with the BTL20 and BTL21 test probe, this battery analyzer is designed to take measurements on stationary batteries of all types. Additionally, this tool covers a broad range of battery test functions ranging from DC voltage and resistance tests to full condition testing.

$5,499.99 USD

1 to 2 Weeks
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Fluke BT521ANG Offers

Reduced testing complexity, a simplified workflow and an intuitive user interface provide a new level of ease-of-use in battery testing.

Ideal test tool for maintenance, troubleshooting, and performance testing of individual stationary batteries and battery banks used in critical battery backup applications. The intuitive user interface, compact design, and rugged construction ensure optimum performance, test results, and reliability. The battery analyzer covers a broad range of battery test functions ranging from DC voltage and resistance tests to full condition testing using an automated string function testing and the test probe integrated infra-red temperature measurement system.


  • Key measurements: Internal battery resistance, dc and ac voltage, dc and ac current, ripple voltage, frequency and temperature
  • Sequence measurement mode: Automatic or manual sequence testing of battery strings with automatic measurement storage including voltage, and resistance, eliminating the need to press a button each time a measurement needs to be saved
  • 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, and the combined visual and audio feedback cues reduce the risk of measurement confusion
  • Threshold comparison: Configure multiple reference values and thresholds for resistance and voltage. Comparison result feedback after each measurement via visual and verbal cues
  • Ergonomic test leads: Rugged coaxial two pole kelvin test pins with remote SAVE button reduce test time and increase efficiency
  • Intercell strap resistance test and data management: Measures the resistance of the intercell connection between batteries in a string
  • Test probe extenders: Long reach, straight and angled probes for double stacked cells
  • Intelligent test probe set: Integrated LCD display, infrared temperature measurement, verbal audio feedback and captures voltage readings and temperature logging automatically or via integrated save button
  • Enhanced data analysis: Quickly compare trends, analyze results and create reports with included battery management software
  • Easy reporting: Generate PDF report on the PC software with analysis graphics and data table or quick email format report with csv file on the mobile app
  • Wireless communication: For data download and remote display while measuring. Browse and email measurement data via iOS app
  • 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 maximum rated for safe measurements all around the battery power supply equipment

Voltage and resistance thresholds

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.

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 (requires Software Management software version 1.0.69 or later) readings and perform trend analysis. All measurement data, battery profile and analysis information can be used to easily generate reports.


  • Maintenance
  • Troubleshooting
  • Performance testing of individual stationary batteries and battery banks used in critical battery backup

Fluke BT521ANG Specifications

Battery Resistance/Strap Resistance
Range 3 mΩ
30 mΩ
300 mΩ
3000 mΩ
Resolution 0.001 mΩ
0.01 mΩ
0.1 mΩ
1 mΩ
Accuracy 1% + 68
0.8% + 12
0.8% + 6
0.8% + 6
Range 6 V
60 V
600 V
1000 V
Resolution 0.001 V
0.01 V
0.1 V
1 V
Accuracy 0.09% + 5
(45 to 500 Hz with 800 Hz filter)
Range 600 V
Resolution 0.1 V
Accuracy 2% + 10
Range 500 Hz
Resolution 0.1 Hz
Accuracy 0.5% + 8
AC Voltage Ripple
(20 KHz Max)
Range 600 mV
6000 mV
Resolution 0.1 mV
1 mV
Accuracy 3% + 20
3% + 10
A DC/A AC (with i410)
Range 400 A
Resolution 1 A
Accuracy 3.5% + 2
Range 32 to 140°F (0 to 60°C)
Resolution 1°C
Accuracy 4°F (2°C)
General Specifications
Meter Mode 999 records for each measurement position with time stamp
Sequence Mode Up to 100 profiles and 100 profile templates (each profile stores up to 450 batteries) with time stamp
Temperature Operating: 32 to 104°F (0 to 40°C)
Storage: -4 to 122°F (-20 to 50°C)
Battery charging: 32 to 104°F (0 to 40°C)
Operating Humidity Non-condensing (50 °F [10°C])
≤80% RH (at 50 to 86°F [10 to 30°C])
≤75 % RH (at 86 to 104°F [30 to 40°C])
Altitude Operating: Sea level to 2000 m
Storage: Sea level to 12,000 m
IP Rating IP40
Radio FCC Class A
Vibration Requirements MIL-PRF-28800F: Class 2
Drop Test Requirements 1 meter
Temperature Coefficients Add 0.1 x specified accuracy for each °C above 28°C or below 18°C
Safety Compliance 600 V CAT III
EMC IEC 61326
Protection Class 2 Pollution Degree II
Battery Compliance UN38.3
2G per IEC68-2-26, 25G, and 29
Screen Dimensions 3 x 2.2" (7.7 x 5.6 cm)
Interface USB mini
Dimensions 9 x 4 x 2" (22 x 10.3 x 5.8 cm)
Weight 1.9 lb (850 g)
Click here for complete specifications on the Fluke BT521ANG

What's included with the Fluke BT521ANG

  • Battery Analyzer
  • 4-Wire Test Pin Set
  • Basic Test Lead Set
  • TwistGuard™ Test Leads with Adapter
  • Intelligent Test Probe Set with Extender and Angled Tips
  • Intelligent Test Probe Set with Extender and Temperature Sensor
  • 18 V AC Charger
  • Standard Mini-b USB Cable
  • 2 x Spare Fuses
  • Shoulder Strap
  • Belt Strap
  • Magnetic Hanging Strap
  • Soft Carrying Case
  • 7.4 V 3000 mAh Lithium-Ion Battery
  • 100 x Paper Battery Tags
  • Fluke Battery Management (CD) Containing USB Driver and Manuals in All Languages

Webinar: Introduction to Portable Precision Power Analyzers with Fluke

This wideband precision analyzer is accurate enough for the lab, yet it's built for the field. Offering you more freedom than ever before to make high accuracy power measurements wherever you need to. Whether in the lab, or in the field. Designed for portability and eliminates the need to carry large, fragile, expensive analyzers into the field, allowing you to make measurements directly at the load in nearly any environment. By measuring directly at the load, you can discover how the equipment operates under real-world conditions, with real-world variables, not just at a test bench or in the lab.
During our 1-hour webinar, we've covered:
- The new Fluke Norma 6000 Power Analyzer for accurate measurements at frequencies from DC to 500kHz.
- It is not a Power Quality Analyzer.
- It is a Power Analyzer for accurate measurements at frequencies from DC to 500kHz.
- It is designed to be used in the field, its rugged, battery-operated, lightweight, and suited to use outside of a laboratory environment.
- You’ll learn why it can help you, where and how it is used.


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Customer Reviews for the Fluke BT521ANG