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Discover what you can do with a tester

What is the voltage range of batteries that I can use?

BA600: 24V-48V
BA900: 24V-48V
It is true that a fully charged battery has a higher voltage, but that is OK.
E-Bike batteries are mostly 24, 36 or 48V, so they can all be tested.

What does Load Voltage and Open Voltage mean?

The Analyzers measure the voltage during load, and when the load is dis-connected from the battery.
The voltage measured when dis-connected is called the Open Voltage. Both are used to compute the battery’s internal resistance (impedance).
Because of current effects, special DSP (Digital signal processing) algorithms are used to compute the impedance and Open Voltage.

What does it mean: Peak power?

The maximum and peak power is important to know how the bike motor can be simulated during acceleration. Nomally, the peak current is then almost 2x as high as the normal motor power.
A proper analyzer must be capable of testing the acceleration.
Examples for different type:

Bike Motor power Peak power Best analyzer
Pedelec 250W 450W BA600
S-Pedelec 350W 630W BA750
S-Pedelec 500W 900W BA900

All analyzers can be used upto a certain maximum power. But it also has a current limit like 16Amp (BA600/750/900). Power (in Watt) is the product of the voltage and the current (P = V * I).
As example; 500W at 36V translates to a maximum current of some 12 Amp.
Here is a table of the maximum settings that are allowed:

Battery Voltage Maximum discharge current
24 V 16 A
36 V 12 A
48 V  8A

Note that the max. current is computed at the Voltage of the fully charged battery, not its nominal value.
The BAxxx analyzers will automatically trim power and current to within the allowed operating area.

I want to do a measurement with different currents. Can I do this?

Yes, you can. But for this, you need access to Battery Profile editting.
Battery manufacturers, battery repair and test shops can request access via a ‘support’ request.

Can I test 2 batteries in parallel?

Yes. The analyzers have 1 discharge unit, and you connect 2 chargers and to batteries.
Since charging is most time consuming, time reduction is mainly achieved by activating the chargers in parallel. So the charge-discharger-recharge sequence for 2 connected batteries and chargers is:

Chan 1 Charge Discharge Charge
Chan 2 Charge Discharge Charge

The charge time is usually about 5 to 8 hours, the dis-charge time about 1.5 hour.
The advantage is that you can run the system unattended overnight and have 2 batteries tested.

Impedance / Resistance measurement

Impedance is the general name for internal resistance measured using frequencies, like 0Hz (resistance) and 100Hz or 1000Hz (impedance). The Analyzers do both the resistance and impedance measurement. Both are computed from the “Open cell voltage” (VOC) and voltage during load (VLD) and load current (ILD): Resistance = (VOC – VLD) / ILD. This represents the resistance in the battery and wires (inside the battery pack).
The resistance of the connection wires from the battery to the analyzer is compensated by use of the SENSE+ and SENSE- wires.

When applying long-term load differences, the resistance of the battery at 0Hz can be determined. For this, the discharge method “Resistance measurement” can be added to the measurement profile.
This applies the 50% and 100% of the specified current in sequence during some seconds. Then the resistance is calculated and put into the output report.

Can I do a test Without a charger ?


Just start the measurement, and set the Checkboxes at the bottom of the dialog like so:

Then the charger is not used.

Please note that the measurement result will be equal or less than when charged automatically. If the battery was not fully charged, the value wil be less.

How To ….

For users of our battery analyzers

How do I do a measurement?

  • Connecting the battery, use the connection tabs from the Terminal Converter Set (TCS) or your dedicated cable.
  • Connect the charger to the battery Please note that in rare cases, a dedicated cable has a provision for charger connection.
  • Start the PC software: Start the Battery Analyzer program.
  • Press the button on the Battery Analyzer, for the channel you want to start.
  • Fill in the battery parameters and press start.
  • The rest is fully automatic! Although the system, continuously shows the measurement results, there is no need to look at this.

Make sure the printer is connected, switched ON and set as Default in Windows.
After completion, the report is automatically printed.
You can view the PDF report. Go to File | Explorer | Reports.

How do I store a battery while preserving it’s life

The internal chemistry of a battery is sensitive to temperature and voltage.
The general rules are:

  • A high temperature causes more wear (temperatures above 30 degree C)
  • Low Voltage causes more wear (capacity below 20%)
  • High Voltage causes more wear (capacity above 80%)

So the best way to store a battery is at medium voltage and at low temperature.
BUT: too low (or fluctuating) temperatures may cause more condensation which may damage the electronics.
So the recommendation is:

  • So storage at 10 to 25 degree C is a good compromise (in your hall or basement).
  • Set an agenda alarm (or note) for every 6 weeks to check the reading to be about 50-75%. Charge for 30min if needed.

Where can I get training

The installation and operation of the device is rather simple. No training is required.

For the interpretation of results and finding causes of problems, a training on E-Bike repair may be usefull.

There are a few trainings available:

Name Brand Country Website
Tweewieler Academy various Nederland
Syntra various België
TranzX JD/TranzX Deutschland

How to interpret a test report

Normally you will have the charger connected and the tester control the charger. If not, you must be certain that the battery was fully charged before testing.

On the report, there are 3 important number to look at:

  • Capacity in Wh
  • Capacity in Wh
  • Internal resistance

They can be found in the Test results part of the report (see this example).

The battery is either specified in Ah or Wh (example: 11Ah or 400Wh). Both numbers are on the report. In this case, both indicate around 96.6% you can assume that this is correct. The impedance (internal resistance) is below 400mOhm (and  even below 200). Tis is a good value. Lower is always better.

The conclusion is that the battery is very good and can be used normally.

The graphs give extra information:

The first 2 graphs show the voltage (red), current (blue) and the impedance (internal resistance, green).

The curves are nice and smooth. During the parts with constant current (in this case the entire measurement) no irragularities should show.
On the 2nd plot, you may read the capacity in Ah at the moment the voltage stops.

Finally, the charging curve shows the voltage during charging. If you battery allows BMS readout, most batteries will also show the temeprature during charging.

Battery Condition Test – The Test report explained
This video explains the meaning of the information on the test report.

How do I get support

We provide support through the web site and e-mail. Please first read the Questions and Answers below and –only when you cannot find the topic:

If you have a general question (not about a measurement):

  • Read the “questions and answers” on this page.
  • Look at the right side at  “Ask your question here”.
  • Please prepare a short description of what you would like to know.

If you have a question about a measurement:

  • attach the .bctdata file (File | Explore | Reports).
  • Press from the program: Help | Support and copy the system information into the email.
  • Provide a short description of what you would like to know.


When you contact us without sending this, we need to ask you anyway to send this.
So it saves both of us time and it is easier for you to send an email while not being on the phone. This way we can serve you better.

How do I activate a pre-release version?

There is a ‘Stable’ software version, and a Pre-release version. The Pre-release version is available for testing and using new features and improvements. We periodically make improvements and put this in the Pre-release version. If that all works fine, we move that to the ‘Stable’ version.

Note: Activating the pre-release version is rarely done by dealers, but by e-bike (system) manufacturers who requested or need new features. Normally, please use the well tested “stable” version only.

You may activate the Pre-release version in Options | Preferences. Look at the right side and set “Pre-release” to Yes. If a new feature causes problems, you may revert to the ‘Stable’ version at any time.

How do I turn off Automatic Printing?

After a test, the report is automatically printed. This can be disabled in “Options | Preferences”.
Then on the right side is “Measurement Settings”. Now set “Print after measurement” to False.
Generally, it is not a good idea to turn this off; it is a very convenient feature that reports are being automatically printed.

Technical questions

Learn more about the technical background

Does is matter what type of battery I want to test?

Not really.

Non-Lithium batteries can safely be tested with the standard settings of the analyzer.
With some batteries, you may want to change the limit of the empty-voltage. This is the voltage at which the test must end since further discharging may result in a deep-discharge.

What is Capacity in mAh or Wh?

Ah (Ampère hours) / mAh (mili-Ampère hours)

The battery capacity is the amount of current drawn from the battery, multiplied by the time it takes before it is empty. It is often expressed in Ampère-hour (Ah). For more accuracy it may be expressed in milli-Ampère-hour (1/1000th of an Ampère-hour).

To translate from mAh to Ah, just divide by 1000.

Wh (Watt hours)

Capacity can also be expressed as the amount of energy (Watt) drawn from the battery, multiplied by the time it takes before it is empty.


Some manufacturers put the capacity in Ah, other in Wh, and some put both numbers. Since the Ah is independent of the voltage, while the Wh does depend on voltage, measurement results will normally be a bit different between the two methods (up to some 3 to 5%).

How long will a test take?

A battery test can best be done at the current that is drawn during normal operation. That results in a battery time that is comparable to the usage time.

It is possible to speed-up the test by increasing the test current. However, care must be taken not to exceed the maximum allowable current for the battery under test.

Normal values are:

Capacity Test Current Test hours
 10 Ah  (360Wh)  6 A  1h35
 14 Ah  (500Wh)  6A  2h20
 6 Ah  (215Wh)  4A  1h30

If the test runs at full motor power the time may be calculated as Time = Battery capacity [Wh] / Motor power [W].

What is the principle of testing?

With the test, we want to determine the actual capacity of the battery to hold energy. This is done by charging the battery to 100% and discharge it with a constant test current. The time till 0% is measured.
The product of Time * Test current is the capacity in Ah.
Example:  A test of 1h30 with a current of 6 A results in 9 Ah capacity.

Important: To determine whether a battery can handle the power of acceleration or up-hill driving, we provide a special test profile to simulate that.
The result of that test shows the real street performance of the battery.

What is a BMS?

A BMS is the Battery Management System. It is used in Lithium Ion batteries to protect the battery against short circuits and over-current. A most BMS’s also protect against deep-discharge and over-charging.

If a BMS fails, the battery may be damaged and can become dangerous, since it may ignite and burn into flames.

Some batteries have a BMS without connections to the outside world. Others provide connections to allow read-out by special electronics and software. Depending on the BMS protocol, the Battery Condition Test software V3, can read the BMS data, using our analyzers.

What is a C-rate?

Often, the maximum charge and discharge current of a battery is specified as 0.2C, 0.5C or 1C.
1C means that the full battery capacity used in 1 hour.

The table shows some examples of capacities, Currents and C-rates:

Capacity (Ah) C-rate Current (A) Time (h) Time (h:mm)
10 1C 10 1 1:00
10 0.2C 2 5 5:00
10 0.6C 6 1.67 1:40
10 2C 20 0.5 0:30

Checking the measurement accuracy

If there are doubts about the calibration of the Battery Analyser you can verify it.

This can be done by following the next simple steps.

The following items are needed:

  • A multimeter capable of measuring at least 10A DC
  • A fully charged battery (24V, 36V or 48V will work).
  • The standard battery cable as delivered with the Battery Analyser

Checking the voltage measurement:

  • Switch the Voltmeter to DC Volts
  • Connect the Volt meter to the + and – of the Battery
  • Do NOT start a measurement
  • Check if the voltage displayed by the meter is within 2% of the value displayed in the software at “Voltage Loaded”
  • Example: When the “Voltage Loaded” shows 41.15V the multimeter should show a value between 41.97V and 40.33V. If it does not, please contact battery Condition Test by filling out the contact form on this page.

Checking the Current measurement:

  • Switch the Current meter to DC Amp measurement
  • Connect the Current meter in the + lead
  • Note: Use Average current measurement NOT RMS
  • Start a Warranty Evaluation test and set the current to 5A.  Click here for test settings
  • Disable the Pre-Charge in order to speed up the process
  • Check if the current, displayed by the meter is within 5% of the value as displayed in the software at “Current:”
  • Example: When the “Current” shows 5.00A the multimeter should show a value between 5.25A and 4.75A. If it does not, please contact battery Condition Test by filling out the contact form on this page.


My battery BMS has switched off. Can I reset it?

When a battery is deep-discharged, a BMS may decide that it is unsafe to re-charge the cells.
So if it has shut down the battery, think twice to ‘re-vive’ it.

If you sill want to try, use a Lab-power supply with adjustable current limit.
The power supply must be set to:

  • A voltage, equal to the charger voltage
  • Maximum short circuit current of 100mA
  • Connect this to the battery output Bat+ and Bat-, instead of the charger input pins
Warning: If you do not know how to do this, ask someone who does. Do not ‘just give it a go’, since you may easily burn down your office/home.

How can I test Sparta-Ion

Sparta Ion can be tested by making a T-connection between the Motor and the Frame (use a black wire instead of blue as on the picture).
The BA_xxx is connected to the Red (+) and Black (-) wires.

Connector types (AMP part numbers):

Side Connector type Body Contacts Other Wire
Frame side AMP Super seal 1.5 series 282087-1 183025-1 or 282110-1 Seal 1 per wire 281934-2 1.5mm2 or 14~15 AWG
Motor side AMP Super seal 1.5 series 282105-1 183024-1 or 282109-1 Seal 1 per wire 281934-2
Pin Function Color
1 + Red
2 Sig Yellow
3 Black

Cut a part of the isolation of the Red and Black wire and connect the BA_xxx red and black wires.
You may use the crimp elements from the Terminal Converter Set to make your Ion connection it detachable.

Test procedure

Fully Charge the battery before test.
During test, the charger must not be connected.
Then disable pre- and post charge in the start dialog.
Note that the battery must be kept active during test. Otherwise the battery will shut off which will terminate the measurement.

What is an acceptable battery wear rate?

The decrease of capacity is caused by the use of the battery. When a battery becomes empty, after a 100% charge, 1 cycle is counted. Generally, most Lithium batteries wear about 30 to 40% in 500 cycles.

Whether a battery is still fit for the job, you need to consider the use of a battery that can do only 60 or 70 % of its original distance.

What is an acceptable internal resistance or impedance?

Most good batteries have an internal resistance and impedance between 120 and 200 mOhm. A lower value is even better.

In our test profiles we let a battery fail when the value exceeds 400mOhm. In this case, the battery will probable also fail on a low capacity due to the high loss of voltage in the internal resistance.

Which test conditions should be observed?

There are 2 test conditions that are of interest:

  1. Test for normal use
    In this test you want real life conditions, meaning a constant load of 100% of the motor power (often 250W) and peaks for acceleration and hill climbing (upto 1.8 times the normal power).
    So a 36V battery should be tested at about 7 Amp with peaks to 12.5 Amp.
  2. Test for manufacturer warranty
    Most cells are specified at a discharge of 0.2C, meaning 0.2 times the rated capacity.
    So a battery of 10Ah should then be tested with 10 x 0.2 = 2A.

Here you can see the requirement for a good battery tester. It must be capable of testing at higher power to reveal possible battery problems.
The BA610, BA760 and BA910 testers all handle this nicely.


Error messages

Find information about messages from the software

Device Reconnected

The USB connection of the tester was re-connected after a disconnect.

Possible causes:

  • The computer and software restarted after a power-loss
  • Bad USB cable
  • Bad USB port on the computer

You may try a different port on the computer and/or a different USB cable.

Otherwise contact your supplier.

The channel list shows RED

Before you read on first check whether the power cable is securely plugged into it’s socket. Also if you use a mains power block with a switch, make sure that the switch is set to On.

Sometimes, after changing the USB plugs, Battery slots show RED in the Channel list.
The program must re-assign the ports to the slots. Therefore the existing configuration must be deleted.

To remove the Slot data:

  • Close the BatteryAnalyzer V3 program.
  • Open the Windows File Explorer (Verkenner).
  • Type in de address bar: %ProgramData%\BatteryAnalyser and hit ‘Enter’.
  • Select the folder SlotData and delete it.
    A prompt dialog appears the explains you need administrator permission. Just click Continue.
  • Start the BatteryAnalyzer V3 program.

Now the problem should be resolved.

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