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 Precision Voltage Internal Resistance Battery Tester

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Know your power, own your charge — precision testing for the battery-savvy pro.

VIVID HD DISPLAY - Advanced TFT color screen delivers crystal-clear, easy-to-read results that elevate your testing experience.
COMPACT PROFESSIONAL - Lightweight handheld design with CE & RoHS certifications—trusted by pros, perfect for your tech toolkit.
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 a full battery health profile.
UNIVERSAL BATTERY COMPATIBILITY - From AAA to car batteries, test up to 8 batteries in batch mode with historical data tracking and export.

The FNIRSI HRM-10 is a professional-grade handheld battery tester that simultaneously measures voltage (up to 100V) and internal resistance (up to 200Ω) using a Kelvin four-wire method for superior accuracy. Featuring a vibrant TFT HD color display, it supports a wide range of batteries from household AAAs to car batteries, with the ability to store and export historical test data. Lightweight and certified (CE, RoHS), it’s an essential tool for electronics enthusiasts and professionals who demand reliable battery health diagnostics.

Specifications

ASIN	B0D6FPBGCX
Best Sellers Rank	#16,291 in Automotive ( See Top 100 in Automotive ) #29 in Battery Testers
Brand Name	FNIRSI
Color	Black
Customer Reviews	4.4 4.4 out of 5 stars (173)
Included Components	Date cable and kelvin clip test line
Item Highlight	100V 200Ω, for All Types of Batteries, Car Battery Tester, Voltage Meter, AAA AA Battery, Digital Household Battery Analyzer
Item Weight	13.61 g
Manufacturer	FNIRSI
Measurement Type	Ohmmeter, Voltmeter
Model	FNIRSI HRM-10
Number of Items	1
Part Number	001
Power Source	Battery Powered
Specification Met	CE, RoHS
Style Name	Black
Upper Temperature Rating	45 °C

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