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FLUKE 500 series battery analyzers
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BT521 Battery Analyzer Contact us for more details

  • Battery Voltage �V During the internal resistance test, Fluke Battery Analyzers also measure the voltage of the battery under test

  • Discharge Volts �V 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 �V 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 �V 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 �V Users can configure a maximum of 10 sets of thresholds and receive a Pass/ Warning/ Fail indication after each measurement

  • AutoHold �V 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 �V When AutoSave is turned on, measured values are saved to internal memory automatically after an AutoHold reading is captured

  • Fluke Battery Management Software �V 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 �V 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 �V Quick, guided setup ensures you're capturing the right data every time

  • Battery life �V 7.4 V 3000 mAh lithium-ion battery for more than eight hours continuous operation.

  • USB port �V For fast data download to supplied data analysis and report management application software.

  • Highest safety rating in the industry �V CAT III 600 V, 1000 V dc max. rated for safe measurements all around the battery power supply equipment.
   Fluke BT521 key features1:
   (Designed for users who need to incorporate temperature measuring)
  • 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

Functions Range Resolution Accuracy BT508 BT510 BT520 BT521
Battery resistance1 3 m�[ 0.001 m�[ 1% + 8 �� �� �� ��
30 m�[ 0.01 m�[ 0.8% + 6 �� �� �� ��
300 m�[ 0.1 m�[ 0.8% + 6 �� �� �� ��
3000 m�[ 1 m�[ 0.8% + 6 �� �� �� ��
Vdc 6 V 0.001 v 0.09% + 5 �� �� �� ��
60 V 0.01 v 0.09% + 5 �� �� �� ��
600 V 0.1 v 0.09% + 5 �� �� �� ��
1000 v 1V 0.09% + 5 ��
Vac (45 Hz to 500 Hz with 800 Hz filter) 600 v 0.1 v 2% + 10 �� �� ��
Frequency (displayed with Vac and Aac)2 500 Hz 0.1 Hz 0.5% + 8 �� �� ��
AC voltage ripple (20KHz Max) 600 mV 0.1 mV 3% + 20 �� �� ��
6000 mV 1 mV 3% + 10 �� �� ��
Adc/Aac (with accessory Fluke i410) 400 A 1 A 3.5% + 2 ��
Temperature 0�XC to 60�XC 1�XC 2�XC (4 �XF) ��
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
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 Modes BT508 BT510 BT520 BT521
Resistance (m�[) �� �� �� ��
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 communication       ��
Memory view �� �� �� ��

General Specifications
Size (HxWxD) 22 cm x 10.3 cm x 5.8 cm (9 in x 4 in x 2 in)
Weight 850 g (1.9 lb)
Screen dimensions 7.7 cm x 5.6 cm (3 in x 2.2 in)
Interface USB mini
Warranty 3 years

Environment Specifications
Operating temperature 0�XC to 40�XC
Storage temperature -20�XC to 50�XC
Lithium-ion battery charging temperature 0�XC to 40�XC
Operating humidity Non-condensing (10�XC)
<=80% RH (at 10�XC to 30�XC)
<=75% RH (at 30�XC to 40�XC)
Operating altitude Sea level to 2000 meters
Storage altitude Sea level to 12,000 meters
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 degree C above 28�XC or below 18�XC
Safety compliance 600 V CAT III
EMC IEC 61326
ROHS China, Europe
Protection class 2 Pollution Degree II
Battery compliance UN38.3
2G per IEC68-2-26, 25G, and 29

Fluke battery testing
Data center performance with Fluke battery analyzers
Fluke Battery Analyzers for Datat Center

Battery testing

It only takes one bad cell to take down an entire string.

Your batteries protect you and your clients from interruptions and anomalies in power and give you peace of mind in your quest to never let the system go down. But batteries have a myriad of vulnerabilities, and it only takes one bad cell to take down an entire string.


Common causes of battery failure


The main cause of battery failure is heat. For every 8 oC (15 oF) (average) temperature, battery life is halved. Increased temperature causes electrolyte to be expelled from the battery, which degrades the plates. Early stages of dry-out can result in drops in capacity that are not readily apparent. Early detection of this type of failure is important. Once a battery is damaged by heat it is impossible to restore capacity.

Overcharging/ undercharging

Charging problems in batteries can result in shedding, corrosion, and sulfation (where lead oxide turns to a crystal form.) Sulfation-reducing technologies can lower this risk, but once present sulfation can be impossible to remove and those batteries should really just be replaced.


Vibration can lead to multiple failures, including corrosion, internal shorts, damage to connections, and inability to charge or discharge.

Internal short

According to the 2010 BCI Failure Modes Study, shorted batteries currently account for 18 percent of battery failures. Battery shorts can be caused by all of the issues described here, in addition to manufacturing defects, lead drop and excessive shock.


Generally speaking, the older the battery the more likely it is to experience failure. Older batteries are also more likely to exhibit increased impedance, and can yield differing voltages that cause them to fall out of line from the string.

Fluke BT500 Series Battery Analyzers

The new Fluke BT500 Series Battery Analyzers reduce testing complexity, simplify workflow to greatly reduce test time for battery strings, and provide a new level of ease-of-use in battery testing.

The new Fluke BT500 Series Battery Analyzer is the ideal test tool for maintenance, troubleshooting and performance testing of individual stationary batteries and battery banks used in critical battery back-up applications. The intuitive user interface, compact design and rugged construction ensure optimum performance, test results and reliability. Fluke BT500 Series Battery Analyzers cover 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 infrared temperature measurement system. BT500 Series Battery Analyzers are designed for measurements on stationary batteries of all types.

�� Highest safety rating in the industry:

Fluke 500 series battery analzyers

Fluke 500 series battery analzyers

CAT III 600 V, 1000 V dc max. rated for safe measurements all around the battery power supply equipment.

�� Sequence measurement mode:

Automatic or manual sequence testing of battery strings with automatic measurement storage including voltage, resistance and temperature (with BTL21 intelligent test probe).

�� Comprehensive logging:
All measured values are automatically captured during testing and can be reviewed on the instrument before downloading for on the-go analysis.

�� Threshold comparison:
Configure multiple reference values and thresholds for resistance and voltage. Comparison result feedback after each measurement via visual and verbal cues.

�� Enhanced data analysis:
Quickly compare trends, analyze results and create reports with included battery management software.

�� Wireless communication and/or USB port:
For data download and remote display while
measuring. Browse and email measurement data via iOS app. (For BT521 Only)


FLUKE 500series battery analyzers
FLUKE battery analyzers
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