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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🔋 Power up your battery IQ with precision and style!

COMPACT PORTABLE - Lightweight 13.6g design with included Kelvin clip and data cable—ready for on-the-go pros
PRO GRADE ACCURACY - Kelvin four-wire method eliminates contact resistance, ensuring ultra-reliable diagnostics
VIVID HD TFT DISPLAY - Crystal-clear color screen that makes reading results effortless and visually engaging
DUAL PARAMETER PRECISION - Simultaneously measures voltage & internal resistance for instant battery health insights
UNIVERSAL BATTERY COMPATIBILITY - From AAA to car batteries, test them all with batch history and exportable data

The FNIRSI HRM-10 is a sleek, handheld digital battery tester designed for professionals and enthusiasts alike. It delivers highly accurate voltage and internal resistance measurements up to 100V and 200Ω using a Kelvin four-wire connection, displayed on a vibrant TFT color screen. Compatible with a wide range of batteries—from household AAA/AA to car batteries—it supports batch testing with historical data storage and export capabilities, making it an essential tool for anyone serious about battery performance and longevity.

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Manufacturer	FNIRSI
Part number	001
Item Weight	13.6 g
Package Dimensions	20.8 x 12.09 x 7.29 cm; 13.61 g
Manufacturer reference	001
Colour	black
Style	Black
Power source type	Battery Powered
Item Package Quantity	1
Measurement Accuracy	± 0.5%
Included components	Date cable and Kelvin clip test lead
Batteries included?	No
Batteries Required?	No

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

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