FNIRSI HRM-10 Battery Voltage Internal Resistance Tester


Product Details

Parameters Table
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Basic Specifications:

- Device Name: FNIRSI "HRM-10"

- Type: Handheld high-precision battery internal resistance meter

- Measurement Method: True four-wire measurement

- Measurement Ranges:

- Voltage: 0 — ±100V (DC)

- Resistance: 0 — 200Ω

- Accuracy: ±0.5%

- Instrument Test Signal Frequency: AC 1KHz

- Rechargeable: Type-C interface (5V/1A)

- Built-in Battery: 1000mAh lithium battery

- User Calibration: Supported


FNIRSI "HRM-10" is our company's first handheld high-precision attery internal resistance meter. It is a true four-wire measurement internal resistance

meter, designed with precision, convenient to carry. The device can automatically test internal resistance and voltage values simultaneously, with measurement results displayed on the screen. Users can also manually adjust the voltage and resistance range. The product features a sorting mode, automatically filtering the good and bad batteries based on user-set thresholds. It also supports historical records and exporting data tables of historical measurements.

Display and Technology:

- Screen: HD Color Screen

- Measurement Results Display: On-screen display

Functionality and Features:

- Measurement Modes:

- Automatic Testing of Internal Resistance and Voltage

- Manual Adjustment of Voltage and Resistance Range

- Sorting Mode: Automatically filters good and bad batteries based on user-set thresholds

- Historical Records: Supports historical records and exporting data tables of historical measurements

Connectivity and Power:

- Connectivity: Type-C Interface

- Power Input: 5V/1A

Package Size:

- Size: 158.7×80.5×28.4mm

- Weight: 225g

Package Contents:

- HRM-10 Host: 1

- Clip Test Line: 1

- Type-C Data Cable: 1

- User Manual: 1

- Packaging Box: 1

Warning Tips:

1. Electrical Safety:Always ensure that the device is used in accordance with electrical safety standards to prevent electric shock or damage to the equipment.

2.High Voltage: Exercise caution when working with high voltage signals. Make sure to use appropriate safety measures and protective gear to avoid injury.

3. Proper Grounding: Ensure that the oscilloscope is properly grounded to prevent electrical hazards and ensure accurate measurements.

4. Overloading: Avoid applying signals that exceed the specified input voltage range to prevent damage to the device.

5. Heat Dissipation: Allow the device to dissipate heat effectively by ensuring proper ventilation around the device during operation.

6. Firmware Updates: When performing firmware updates, ensure that the process is carried out correctly to avoid any potential disruptions or errors in the operation of the device.

7. Battery Usage: Follow the manufacturer's instructions for charging and using the battery to prevent overheating, fire, or explosion hazards.

8. Storage and Transportation: Store and transport the device carefully to prevent physical damage or exposure to extreme environmental conditions.

9. User Manual: Always refer to the user manual for proper usage instructions, safety precautions, and troubleshooting guidelines.

10. Maintenance: Regularly inspect and maintain the device to ensure optimal performance and safety. If any abnormalities are detected, discontinue use and seek professional assistance.



Please read our FAQs page to find out more.

Zero Adjustment Issue

   If the two clips are shorted and do not read zero but show x.xxx mΩ, this is normal. The minimum value (which could be zero or very close to zero) is only displayed when the two clips make perfect contact. It doesn't matter if it's not zero. During measurement, the internal program has already calculated the theoretical value, so accuracy is not affected, and zero calibration is unnecessary.

Does the Battery Need to be Fully Charged for Measurement?

   The internal resistance of a battery usually differs when it is fully charged versus when it is low on charge. Specifically, the internal resistance changes depending on the state of charge:

   - Fully Charged State: When the battery is fully charged, the internal resistance is typically lower because the chemical reactions inside the battery are more active, allowing charges to transfer more easily.

   - Low Charge State: When the battery is low on charge, the internal resistance generally increases. As the battery discharges, the internal chemical reactions become less active, making charge transfer more difficult, which leads to an increase in internal resistance.

Measurement Results are Unstable or Inaccurate

   Unstable or inaccurate measurement results may be due to poor contact between the test clips and the battery, instability of the battery being tested, oxidation on the electrodes, or interference from a strong electromagnetic field in the surroundings.

Measured Internal Resistance is Greater than the Battery's Internal Resistance

   When measuring high-capacity batteries (with very low internal resistance), it is crucial to pay attention to the position of the clips. The internal resistance of the battery electrodes or connecting wires is often greater than that of the battery itself. Therefore, when measuring low-resistance batteries, ensure that the clips are properly positioned and make good contact.

What Types of Batteries Can Be Measured?

   The HRM-10 can measure any type of battery, including lithium batteries, lead-acid batteries, nickel-chromium batteries, and dry cell batteries.

Why Can Measuring Internal Resistance Determine Battery Quality?

   The internal resistance of the same type of battery increases and capacity decreases over time with use. The smaller the internal resistance, the stronger the load capacity; otherwise, it may overheat or fail to operate. Batteries with better performance age more slowly, while those with poorer quality age more quickly.

What is the Typical Internal Resistance of an 18650 Battery?

  The internal resistance of a new 18650 lithium battery is generally below 50 milliohms. High-quality ones are around 20 milliohms, average ones around 30 milliohms, and poorer ones are above 50 milliohms.

What Capacity of Batteries Can Be Measured?

   Any capacity of batteries can be measured, regardless of size, as long as the internal resistance is within 0-200 ohms and the voltage is below 100V.

Can Internal Resistance Be Measured Online, and Can UPS Power Be Tested?

   Online testing is possible without affecting the battery's operation, so batteries in UPS systems can be tested without interruption.

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