FNIRSI HRM-10 Battery Resistance Tester

FNIRSI HRM-10 Battery Resistance Tester

Product Description

The FNIRSI HRM-10 is a handheld, high-precision battery tester built to measure internal resistance and voltage simultaneously, giving a clear picture of a battery's true condition rather than relying on voltage alone. As FNIRSI's first dedicated battery internal resistance meter, it's designed for anyone who needs to quickly assess whether a battery is still healthy or quietly failing.

At the core of the HRM-10 is a true four-wire (Kelvin) measurement method, which eliminates the wire and contact resistance that can throw off readings on simpler two-wire meters. This matters because internal resistance is often a better early indicator of battery degradation than voltage alone: a battery can still show a normal voltage reading while its rising internal resistance signals it can no longer deliver current efficiently under load. The HRM-10 applies an AC 1kHz test signal to measure this resistance across a 0–200Ω range, with a voltage measurement range of 0 to ±100V DC and a rated accuracy of ±0.5%.

Results appear together on a TFT HD color display, showing voltage and resistance values at the same time rather than requiring separate tests or mode switching. Beyond straightforward measurement, the HRM-10 includes a sorting mode that lets users set pass/fail thresholds, making it easy to batch-test a group of cells and quickly identify which ones fall outside acceptable limits. This is particularly useful when reusing cells from disassembled battery packs, where inconsistent internal resistance between cells can lead to imbalance and premature pack failure. The device also keeps a history of past measurements and supports exporting that data, which is helpful for tracking a battery's condition over time or documenting test results for repair records.

The HRM-10 supports manual adjustment of both the voltage and resistance measurement ranges, giving more experienced users finer control over testing conditions, and it supports user calibration to help maintain measurement accuracy over the life of the device. It's built to test a wide range of battery types, including car batteries, household AA and AAA cells, button batteries, lithium cells, and lead-acid batteries, making it a versatile addition to a repair or hobbyist bench rather than a single-purpose tool.

Power comes from a built-in 1000mAh rechargeable battery, charged through USB Type-C at 5V/1A, so the tester doesn't need to stay tethered to a power source during use. Its compact, multimeter-sized form factor and simple two-value display make it straightforward to operate in the field or on a bench.

For anyone working with rechargeable battery packs, EV or e-bike cells, or general household batteries, the HRM-10 offers a faster and more informative way to judge battery health than voltage checks alone, without needing a full battery analyzer setup.

Features

• True four-wire (Kelvin) measurement for accurate internal resistance readings

• Simultaneous voltage and internal resistance testing

• AC 1kHz test signal for internal resistance measurement

• TFT HD color display showing both readings at once

• Sorting mode with user-set pass/fail thresholds for batch cell testing

• History recording and data export for tracking measurements over time

• Manually adjustable voltage and resistance measurement ranges

• User calibration support for maintained accuracy

• Rechargeable battery with USB Type-C charging

• Compatible with lithium, alkaline, lead-acid, and other common battery types

Specifications

• Model: FNIRSI HRM-10

• Measurement Method: True four-wire (Kelvin)

• Voltage Range: 0 to ±100V DC

• Resistance Range: 0–200Ω

• Accuracy: ±0.5%

• Test Signal: AC 1kHz

• Display: TFT HD color display

• Internal Battery: 1000mAh rechargeable

• Charging Interface: USB Type-C, 5V/1A

• User Calibration: Supported

• Package Dimensions: 158.7 × 80.5 × 28.4 mm

• Package Weight: 225 g

Applications

• Car and lead-acid battery health assessment

• Household AA, AAA, and button battery testing

• Lithium battery pack cell sorting and matching

• EV and e-bike battery cell diagnostics

• Battery repair and refurbishment quality control

• Tracking battery degradation over time via history logs

• Bulk battery screening for reuse or recycling projects

Package Includes

• 1x FNIRSI HRM-10 Meter

• 1x Kelvin Clip Test Lead

• 1x USB Type-C Cable

• 1x User Manual