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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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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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 every time
DATA DRIVEN DECISIONS - Stores and exports up to 8 historical test records to track battery performance trends
KELVIN 4 WIRE ACCURACY - Custom four-wire connection eliminates contact resistance for ultra-precise readings
DUAL PARAMETER PRECISION - Simultaneously measures voltage & internal resistance for instant battery health insights
UNIVERSAL BATTERY COMPATIBILITY - Effortlessly tests everything from AAA to car batteries, perfect for pros & DIYers alike

The FNIRSI HRM-10 is a sleek, handheld digital battery tester designed for professionals and enthusiasts. It features a 100V voltage range and 200Ω resistance measurement, utilizing a Kelvin four-wire method for superior accuracy. Its vibrant TFT HD color display enhances readability, while broad compatibility covers household to automotive batteries. With data storage and export capabilities, it empowers users to monitor battery health trends and make informed maintenance decisions.

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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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

¥25219

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In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

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TrustScore 4.5 | 7,300+ reviews

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