Why can the measurement of internal resistance be a good or bad sign for a battery?

The battery will be damaged during use, the capacity will decrease and the internal resistance will increase. The lower the internal resistance of the battery, the better the performance and the higher the load capacity.

Does the battery need to be fully charged for measurement?

The internal resistance of a battery is usually different when it is fully charged and when it is low. When the battery is fully charged, the internal resistance is usually lower. When the battery is low, the internal resistance is usually higher.

Why are the measurements unstable?

There is poor contact between the test clip and the battery, or there is a strong background noise.

Why is the measured internal resistance higher than the battery internal resistance?

The internal resistance of a large capacity battery is very low. The internal resistance of the battery electrode or wire is often higher than the internal resistance of the battery.The clamp needs to be in the correct position to get accurate data.

Fnirsi Hrm 10 Voltage Internal Resistance Battery Tester Meter Various

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Description

🔋 Power up your precision — never second-guess your batteries again!

VIVID HD DISPLAY - Advanced TFT color screen delivers crystal-clear, easy-to-read results that elevate your testing experience.
DATA DRIVEN DECISIONS - Stores and exports up to 8 historical test records, empowering you to track battery performance trends like a pro.
KELVIN 4 WIRE ACCURACY - Custom four-wire connection eliminates contact resistance, ensuring ultra-precise measurements every time.
DUAL PARAMETER PRECISION - Simultaneously measures voltage and internal resistance for comprehensive battery health insights.
VERSATILE BATTERY COMPATIBILITY - Effortlessly tests everything from AAA/AA household batteries to automotive power cells with batch data review.

The FNIRSI HRM-10 is a sleek, handheld digital battery tester designed for professionals and enthusiasts alike. It features a high-accuracy Kelvin four-wire measurement system, a vibrant TFT HD color display, and supports testing of various battery types up to 100V and 200Ω internal resistance. With data storage and export capabilities, it’s the ultimate tool for ensuring your batteries perform at their peak.

Specifications

ASIN	B0D6FPBGCX
Brand	FNIRSI
Brand Name	FNIRSI
Colour	Black
Customer Reviews	4.5 out of 5 stars 149 Reviews
Included Components	Date cable and kelvin clip test line
Item Weight	0.48 Ounces
Manufacturer	FNIRSI
Measurement Type	Ohmmeter, Voltmeter
Min. Operating Voltage	100 Volts
Minimum Operating Voltage	100 Volts
Model Number	FNIRSI HRM-10
Part Number	001
Power Source	Battery Powered
Power Source Type	Battery Powered
Specification Met	CE, RoHS
Style	Black
Style Name	Black
Upper Temperature Rating	45 Degrees Celsius

Reviews

P**T

24.02.2026

A**R

26.12.2025

S**G

6.09.2025

S**S

22.07.2025

M**C

23.07.2025

C**N

13.01.2025

J**S

7.03.2026

D**1

11.10.2025

A**R

3.01.2026

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