FNIRSI HRM-10 E-Bike and Electric Scooter Battery Testing Guide Malaysia

Introduction

Electric bicycles and electric scooters use rechargeable battery systems to supply power to their electric motors.

These vehicles are used for personal transportation, delivery services, recreational activities and selected commercial applications.

Over time, an e-bike battery or electric scooter battery may develop performance problems such as reduced travel distance, unexpected shutdown or poor acceleration.

Possible causes include battery ageing, reduced capacity, increased internal resistance, electrical connection problems or battery management system faults.

For qualified technicians working with compatible individual battery cells, the FNIRSI HRM-10 Battery Internal Resistance Tester can provide useful measurements of battery internal resistance and DC voltage.

This guide explains how the FNIRSI HRM-10 can support battery cell inspection, the differences between individual cell testing and complete battery pack testing, and the important safety precautions for electric mobility battery servicing in Malaysia.

What Types of Batteries Are Used in E-Bikes and Electric Scooters?

Many electric bicycles and scooters use lithium-ion battery packs.

Common lithium-ion cell formats include:

• 18650 Lithium-Ion Cells

• 21700 Lithium-Ion Cells

• Other Cylindrical Lithium Cells

• Pouch Cells

• Prismatic Lithium Cells

Some electric mobility systems may also use LiFePO4 batteries or other battery technologies.

The battery chemistry, voltage, capacity and discharge capability depend on the vehicle design.

Battery cell format alone does not determine battery capacity, internal resistance or suitability for a particular vehicle.

Understanding E-Bike Battery Pack Voltage

Electric bicycles and scooters are available with different nominal battery voltages.

Common examples include:

These are general examples. Actual configurations vary between manufacturers.

A battery pack's nominal voltage is not necessarily its maximum charged voltage.

The FNIRSI HRM-10 should not be assumed suitable for direct testing of complete e-bike or scooter battery packs simply because a pack voltage appears to fall within its published DC voltage measurement range.

Complete packs can contain substantial stored energy, battery management electronics and high available fault current.

Why Does Battery Internal Resistance Matter?

Battery internal resistance affects the electrical behaviour of rechargeable battery cells.

When a battery supplies current, its internal electrical characteristics contribute to voltage drop and heat generation.

Higher internal resistance can be associated with:

• Greater voltage drop under load

• Additional internal heating

• Reduced high-current performance

• Differences in performance between similar cells

For electric mobility applications, these characteristics can be relevant because motors may require substantial current during acceleration or hill climbing.

However, the approximately 1kHz AC resistance measured by the HRM-10 is not identical to DC resistance under motor load.

Internal resistance is one diagnostic parameter, not a complete measure of e-bike battery health.

What Is the FNIRSI HRM-10?

The FNIRSI HRM-10 is a handheld battery internal resistance tester.

It is designed to measure:

• Battery Internal Resistance

• DC Battery Voltage

The instrument uses an approximately 1kHz AC resistance measurement method with a four-wire Kelvin connection.

This arrangement is useful for measuring low resistance values on compatible individual battery cells.

FNIRSI HRM-10 Feature Summary

Important: Measurement accuracy, resolution and permitted operating conditions depend on the manufacturer's specifications. The instrument is not a dedicated electric vehicle battery pack analyzer.

Common E-Bike Battery Problems

Problem 1 - Reduced Travel Distance

An electric bicycle may travel a shorter distance than before, even after charging.

Possible causes include:

• Reduced battery capacity

• Battery ageing

• Low ambient temperature

• Increased electrical losses

• Tyre pressure or mechanical resistance

• Changes in riding conditions

Internal resistance measurement may provide supplementary information about compatible individual cells.

However, actual battery capacity and vehicle energy consumption must also be considered.

Problem 2 - Battery Shuts Down During Acceleration

An electric scooter may operate normally at low speed but shut down during acceleration.

Possible causes include:

• Battery voltage sag

• Battery management system protection

• Poor electrical connections

• Controller faults

• Motor problems

• Battery cell performance differences

Recommended approach: Diagnose the complete vehicle and battery system using manufacturer-approved procedures.

Problem 3 - Battery Charges but Does Not Last Long

A battery may reach its normal charging indication but provide limited runtime.

This may be caused by reduced usable capacity or other system problems.

The HRM-10 does not directly measure capacity in Ah or Wh.

A suitable battery capacity or discharge test may be required.

Problem 4 - Battery Becomes Unusually Hot

Abnormal heating can indicate a potentially serious condition.

Possible causes include excessive current, poor connections, internal battery problems or charging faults.

Stop using a battery that becomes abnormally hot, swollen, damaged or shows signs of leakage.

Do not attempt routine testing of an unsafe battery pack.

Can FNIRSI HRM-10 Test a Complete E-Bike Battery Pack?

The distinction between individual battery cell testing and complete battery pack testing is essential.

An e-bike battery pack may contain:

• Multiple lithium-ion cells connected in series

• Parallel cell groups

• A battery management system

• Temperature sensors

• Protection circuits

• High-current wiring

• Charging and discharge connectors

Even when the nominal pack voltage is within the HRM-10's published voltage range, direct testing may be inappropriate.

The FNIRSI HRM-10 is not a universal 36V, 48V, 52V, 60V or 72V e-bike battery pack tester.

For assembled battery packs, use manufacturer-approved diagnostic equipment and procedures.

Only qualified personnel should open or service lithium-ion battery assemblies.

How to Test Individual Lithium Cells with FNIRSI HRM-10

The following procedure applies only to compatible individual cells that can be safely accessed through an approved servicing process.

Step 1 - Identify the Battery Cell

Confirm the manufacturer, model, chemistry and nominal voltage.

Do not assume all 18650 or 21700 cells have identical characteristics.

Step 2 - Inspect the Cell

Check for:

• Damaged insulation

• Deformation

• Leakage

• Burn marks

• Overheating

• Damaged terminals

Do not test visibly unsafe cells.

Step 3 - Prepare the Testing Environment

Use an appropriate battery servicing area.

Keep conductive objects away from exposed battery terminals.

Step 4 - Prepare the FNIRSI HRM-10

Inspect the instrument and Kelvin probes.

Connect the test leads according to the operating instructions.

Step 5 - Measure Battery Voltage

Measure and record the DC voltage.

Step 6 - Measure Internal Resistance

Use stable probe contact and record the resistance reading.

Step 7 - Repeat the Measurement

Repeat unusual readings to check measurement consistency.

Step 8 - Compare Similar Cells

Compare cells of the same model under similar temperature and state-of-charge conditions.

Step 9 - Investigate Differences

Use appropriate additional tests when results differ significantly.

Do not dismantle battery packs, bypass protection circuits or replace individual cells without appropriate qualifications and manufacturer-approved procedures.

Example - Comparing E-Bike Lithium Battery Cells

Consider four compatible 21700 lithium-ion cells of the same model.

A qualified technician measures their voltage and internal resistance.

Illustrative measurements only. These are not universal acceptance limits.

The voltage readings are similar.

However, Cell EB-04 shows a substantially higher internal resistance reading.

The technician should verify:

• Probe contact

• Battery temperature

• State of charge

• Cell identification

• Measurement repeatability

If the difference remains, further evaluation may be necessary.

A single resistance reading does not prove that a battery cell is safe or suitable for reuse in an electric mobility battery pack.

Why Four-Wire Kelvin Measurement Is Useful

Lithium-ion battery internal resistance is often measured in milliohms (mΩ).

At low resistance levels, ordinary test lead resistance can affect measurement results.

The FNIRSI HRM-10 uses four-wire Kelvin measurement to reduce the influence of current-carrying test lead resistance.

This can improve the usefulness of resistance comparisons between similar battery cells.

However, consistent probe contact, temperature and measurement conditions remain important.

E-Bike Battery Internal Resistance vs Battery Capacity

Internal resistance and battery capacity are different characteristics.

A battery with relatively low internal resistance may still have reduced capacity.

Likewise, battery capacity alone does not fully describe high-current performance.

A complete e-bike battery evaluation may require resistance, capacity, voltage and BMS diagnostics.

Can Internal Resistance Explain Poor Hill-Climbing Performance?

Battery internal resistance can contribute to voltage drop when current demand increases.

However, poor hill-climbing performance may also result from:

• Motor limitations

• Controller settings

• Battery management system restrictions

• Vehicle weight

• Tyre condition

• Mechanical drag

• Battery temperature

The HRM-10 cannot independently determine the cause of poor vehicle performance.

A qualified technician should evaluate the complete system.

Applications for E-Bike and Scooter Repair Workshops

Application 1 - Individual Battery Cell Inspection

Qualified workshops may use the HRM-10 to measure compatible individual lithium-ion cells.

Application 2 - Battery Cell Comparison

Resistance measurements may help identify differences between cells of the same model.

Application 3 - Battery Pack Assembly Quality Control

The HRM-10 may support incoming cell inspection before battery assembly.

However, safe assembly also requires capacity matching, suitable components, approved welding procedures and proper battery management.

Application 4 - Electronics Repair

The instrument may be useful for rechargeable batteries used in other compatible electronic devices.

Application 5 - Technical Training

Engineering and electronics laboratories may use the HRM-10 to demonstrate battery voltage and internal resistance measurement principles.

Common Mistakes When Testing E-Bike Batteries

Mistake 1 - Assuming Battery Voltage Indicates Battery Health

A normal voltage reading does not establish full battery capacity or load performance.

Recommendation: Use additional testing when necessary.

Mistake 2 - Testing Complete Battery Packs Without Compatibility Assessment

E-bike packs can contain substantial stored energy and protection electronics.

Recommendation: Follow manufacturer-approved procedures.

Mistake 3 - Comparing Different Lithium Cell Models

Different cell designs can have different normal resistance values.

Recommendation: Compare cells of the same model.

Mistake 4 - Treating Internal Resistance as Capacity

Internal resistance does not directly measure Ah or Wh.

Recommendation: Use a dedicated capacity tester when required.

Mistake 5 - Ignoring Battery Temperature

Battery temperature can affect resistance readings.

Recommendation: Standardize testing conditions.

Mistake 6 - Rebuilding Battery Packs Without Proper Qualifications

Incorrect cell replacement or assembly can create serious fire and electrical hazards.

Recommendation: Battery pack servicing should be performed only by qualified personnel using approved procedures.

FNIRSI HRM-10 vs Complete E-Bike Battery Analyzer

The HRM-10 is best understood as a supplementary battery cell measurement instrument.

It does not replace the equipment needed for complete electric mobility battery system servicing.

Who Should Consider FNIRSI HRM-10 in Malaysia?

The FNIRSI HRM-10 Battery Internal Resistance Tester may be useful for:

E-Bike Service Workshops

For compatible individual cell inspection during qualified servicing.

Electric Scooter Repair Businesses

For supplementary battery cell measurements.

Battery Pack Assembly Workshops

For incoming cell resistance and voltage comparison.

Electronics Repair Technicians

For rechargeable battery troubleshooting.

Engineering Laboratories

For battery measurement experiments and technical training.

Frequently Asked Questions

Q1. Can FNIRSI HRM-10 test e-bike batteries?

It can measure internal resistance and DC voltage on compatible individual battery cells. It is not a universal complete e-bike battery pack tester.

Q2. Can FNIRSI HRM-10 test 36V or 48V e-bike battery packs?

Do not assume that it can. Complete battery packs require manufacturer-approved diagnostic procedures and appropriately rated equipment.

Q3. Can FNIRSI HRM-10 test 18650 and 21700 lithium-ion cells?

Yes, for compatible individual cells within the instrument's specified operating limits.

Q4. Can FNIRSI HRM-10 measure e-bike battery capacity?

No. It does not directly measure battery capacity in Ah or Wh.

Q5. Can internal resistance testing identify a weak lithium battery cell?

It can identify unusual resistance readings that may require further investigation, but additional testing may be necessary.

Q6. Is FNIRSI HRM-10 suitable for electric scooter repair workshops?

It may be useful as a supplementary instrument for qualified technicians who inspect compatible individual rechargeable battery cells.

Conclusion

E-bike and electric scooter battery problems can result from reduced capacity, increased internal resistance, battery management system faults and other electrical or mechanical issues.

The FNIRSI HRM-10 Battery Internal Resistance Tester provides DC voltage and AC internal resistance measurements on compatible individual battery cells.

Its four-wire Kelvin measurement method can support battery cell comparison and selected workshop inspection applications.

For electric mobility service businesses, battery workshops and electronics repair technicians in Malaysia, the HRM-10 can complement existing battery testing equipment.

However, complete electric bicycle and scooter battery packs require qualified personnel, appropriate safety procedures and manufacturer-approved diagnostic equipment.

Internal resistance testing should be considered one part of a broader battery evaluation process.

Where to Buy FNIRSI HRM-10 in Malaysia?

MTM Precision Sdn Bhd supplies electrical testing instruments, battery inspection equipment and industrial measuring tools in Malaysia.

Customers searching for FNIRSI HRM-10 E-Bike Battery Internal Resistance Tester Malaysia can contact MTM Precision for product information, quotations and availability.

We support customers across Kuala Lumpur, Selangor, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kedah, Kelantan, Terengganu, Perlis, Sabah and Sarawak.

Contact MTM Precision Sdn Bhd

MTM Precision Sdn Bhd

Showroom & Service Centre

No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.

Tel: 03-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com

Website: www.mtmpre.com.my

Contact MTM Precision today for FNIRSI HRM-10 product information, quotations and availability in Malaysia.