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.

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FNIRSI HRM-10 Voltage Internal Resistance Battery Tester，Battery Voltage Meter for Types of Batteries, Car Battery Tester, AAA AA Battery, 100V 200Ω, Digital Battery Analyzer for Household Automotive

FNIRSI HRM-10 Voltage Internal Resistance Battery Tester，Battery Voltage Meter for Types of Batteries, Car Battery Tester, AAA AA Battery, 100V 200Ω, Digital Battery Analyzer for Household Automotive

Product ID: 638760265

Details

Brand
FNIRSI
Color
Black
Item Weight
0.48 Ounces
Power Source
Battery
Style
Black

⚡100V max voltage range

🌈TFT HD color display

📊200Ω resistance measurement

S$93

Duties & taxes included

In stock

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Description

🔋 Power up your battery IQ with precision and style!

VIVID HD DISPLAY - Advanced TFT color screen delivers crystal-clear, easy-to-read results
COMPACT PORTABLE - Lightweight handheld design with included test cables for on-the-go diagnostics
KELVIN 4 WIRE ACCURACY - Custom four-wire connection eliminates contact resistance for ultra-precise readings
DUAL PARAMETER PRECISION - Simultaneously measures voltage & internal resistance for battery health insights
VERSATILE BATTERY COMPATIBILITY - Supports everything from AAA to car batteries with batch testing & history export

The FNIRSI HRM-10 is a professional-grade digital battery tester that measures both voltage (up to 100V) and internal resistance (up to 200Ω) using a Kelvin four-wire method for enhanced accuracy. Featuring a vibrant TFT HD color display, it supports a wide range of batteries from household AAA/AA to automotive types, with data logging and export capabilities. Compact and battery-powered, it’s designed for precise, on-the-spot battery health diagnostics.

Specifications

ASIN	B0D6FPBGCX
Best Sellers Rank	#14,587 in Automotive ( See Top 100 in Automotive ) #27 in Battery Testers
Brand	FNIRSI
Brand Name	FNIRSI
Color	Black
Customer Reviews	4.4 out of 5 stars 164 Reviews
Included Components	Date cable and kelvin clip test line
Item Weight	0.48 Ounces
Manufacturer	FNIRSI
Measurement Type	Ohmmeter, Voltmeter
Model	FNIRSI HRM-10
Part Number	001
Power Source	Battery Powered
Specification Met	CE, RoHS
Style	Black
Style Name	Black
Upper Temperature Rating	45 Degrees Celsius

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