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 Precision Voltage Internal Resistance Battery Tester | 100V 200Ω, for All Types of Batteries, Car Battery Tester, Voltage Meter, AAA AA Battery, Digital Household Battery Analyzer

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

Product ID: 638760265

Details

Brand
FNIRSI
Color
Black
Item Weight
13.61 g
Power Source
Battery
Style
Black

⚡100V max voltage range

📊8 sets historical data storage

🔋200Ω resistance measurement

฿5635

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Description

🔋 Power up your diagnostics with precision and style!

VIVID TFT HD DISPLAY - Advanced color screen delivers crystal-clear, easy-to-read results—no more guessing
DATA DRIVEN DECISIONS - Stores and exports up to 8 historical test records—track battery performance like a pro
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 - From AAA to car batteries, test them all with one sleek handheld device

The FNIRSI HRM-10 is a compact, battery-powered tester designed for professionals and enthusiasts alike. It accurately measures voltage up to 100V and internal resistance up to 200Ω using a Kelvin four-wire method, displayed on a vibrant TFT HD color screen. Compatible with all battery types, it stores historical data for up to 8 tests, enabling efficient battery health monitoring and maintenance.

Specifications

ASIN	B0D6FPBGCX
Best Sellers Rank	#18,566 in Automotive ( See Top 100 in Automotive ) #26 in Battery Testers
Brand Name	FNIRSI
Color	Black
Customer Reviews	4.4 4.4 out of 5 stars (167)
Included Components	Date cable and kelvin clip test line
Item Weight	13.61 g
Manufacturer	FNIRSI
Measurement Type	Ohmmeter, Voltmeter
Model	FNIRSI HRM-10
Part Number	001
Power Source	Battery Powered
Specification Met	CE, RoHS
Style Name	Black
Upper Temperature Rating	45 °C

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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฿5635

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered 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 Thailand.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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