$69^.99

Free 30-day Returns

Limit 99999 per customer.

Ships from China.

Sold by Kerllieiyed

Shipped by Kerllieiyed

Price alert

Add to Wish List

Meet Your Seller

Kerllieiyed

See Seller Store

Main image of KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester 2 in 1

Alt view image 2 of 7 - KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester 2 in 1

Alt view image 3 of 7 - KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester 2 in 1

Alt view image 4 of 7 - KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester 2 in 1

Alt view image 5 of 7 - KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester 2 in 1

Alt view image 6 of 7 - KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester 2 in 1

Alt view image 7 of 7 - KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester 2 in 1

Shop All Audiovox - Generic Products | Visit Kerllieiyed Store

KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester 2 in 1

Be the first to review this product...

2-in-1 Professional Diagnostic ToolBattery & Relay Testing - Not just a battery tester. The KONNWEI KW371 integrates an advanced 12V/24V relay tester capable of diagnosing 4-pin and 5-pin automotive relays. Quickly identifies coil failures and contact wear without disassembling the entire fuse boxa must-have for mechanics and advanced DIYers.
Wide Compatibility for 6V/12V/24V Batteries - Unlike testers limited to 12V, the KW371 covers 6V (Motorcycle), 12V (Car/SUV), and 24V (Truck/Boat) systems. It accurately analyzes Lead-Acid, AGM Flat/Spiral, Gel, EFB, and Lithium batteries with a 10-2000 CCA and 5-220 Ah range. Supports multiple global standards including CCA, JIS, EN, DIN, SAE, IEC, and GB.
Cranking & Charging System AnalyzerKnow Your Vehicles Full Health - Perform 3 in-depth tests: Battery Health (SOH, SOC, Internal Resistance, Voltage), Cranking Test (Min/Max starting voltage & milliseconds), and Charging Test (Loaded/Unloaded ripple detection). Instantly determines if the issue is a dead battery, faulty alternator, or failing starter.
User-Friendly with Clear Visual Alerts - Features a graphical waveform display for real-time voltage monitoring. Delivers straightforward results: Good Battery, Replace, Bad Cell, or Charge Retest. Polarity reverse protection ensures safety for beginners. Includes 18 language options (English, Spanish, French, etc.) for global usability.

Overview

Specs

Reviews

Any questions? Our AI beta will help you find out quickly.

Try me now

ABOUT KONNWEI

KONNWEI was born from a passion for automotive innovation and a commitment to making vehicle maintenance smarter and easier.

For every driver who values safety, reliability, and smart vehicle care, KONNWEI was born to make professional auto diagnostics accessible to every household—combining decades of manufacturing heritage, cutting-edge technology, and sincere service to become your go-to brand for OBD2 scanners and car battery testers.
Battery Tester & Relay Tester
KW906 OBD2 Scanner Bluetooth
KW341 Battery Tester
KW340 OBD Scanner
Professional team
Lifetime Technical Support

Battery Tester &amp; Relay Tester 2 IN 1

Battery Tester &amp;amp; Relay Tester 2 IN 1

ABOUT KONNWEI

KONNWEI was born from a passion for automotive innovation and a commitment to making vehicle maintenance smarter and easier.

For every driver who values safety, reliability, and smart vehicle care, KONNWEI was born to make professional auto diagnostics accessible to every household—combining decades of manufacturing heritage, cutting-edge technology, and sincere service to become your go-to brand for OBD2 scanners and car battery testers.
Battery Tester & Relay Tester
KW906 OBD2 Scanner Bluetooth
KW341 Battery Tester
KW340 OBD Scanner
Professional team
Lifetime Technical Support

Why Choose the KONNWEI KW371 2-in-1 Diagnostic Tester? When your engine wont crank or electrical components glitch, the culprit is often a dying battery or a failing relay. The KONNWEI KW371 is the only tool in this class that tests both with professional precision. Save time and money by pinpointing the exact fault before replacing expensive parts. Advanced Battery Diagnostics: Unlike simple voltmeters, the KW371 employs state-of-the-art conductance testing technology to measure your batterys true health. Simply enter the rated CCA value and let the KW371 display the State of Health (SOH%), State of Charge (SOC%), and internal resistance. It clearly distinguishes between a battery that needs a simple recharge and one with a dead cell that requires immediate replacement. Precision Relay Testing: A noisy or intermittent relay can mimic a dead battery. Our integrated relay tester checks 4-pin and 5-pin 12V/24V relays with a 10-cycle consistency test. Green light means good; red light means replace. Its the easiest way to eliminate guesswork from electrical troubleshooting. Comprehensive System Analysis: Test the alternators output under load and idle to detect high ripple voltage or overchargingconditions that silently kill modern AGM and EFB batteries. The cranking test captures millisecond voltage drops to assess starter motor draw. Wide-Ranging Compatibility: From motorcycle 6V lithium packs to heavy-duty 24V truck deep-cycle batteries, the KW371 covers it all. It seamlessly supports CCA, GB, SAE, EN, DIN, IEC, and JIS standards. Whats in the Box: 1 x KONNWEI KW371 Main Unit, 1 x User Manual, 1 x USB Cable (for PC connection).

Details
Brand	KONNWEI
Features	KW371 battery tester, User Manual, USB Cable, Corded Electric, false
Height	6.3 L x 3.5 W x 0.91 H inches
Width	6.3 L x 3.5 W x 0.91 H inches
Length	6.3 L x 3.5 W x 0.91 H inches
Weight	9.52 ounces
Sports Team	1 Piece

Additional Information
First Listed on Newegg	July 21, 2026

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Please contact the Seller directly for warranty information. Warranty information may also be found on the Manufacturer's website.
CONTACT

Return Policies

Return for refund within: 30 days
Return for replacement within: 30 days
This item is covered by Kerllieiyed Return Policy

Manufacturer Contact Info

For a directory of all our manufacturers, please click below.
Manufacturers Directory

Item#: 9SIC7MKM1X7434

Meet Your Seller

KONNWEI KW371 6V/12V/24V Battery Tester & 4/5Pin Relay Tester 2 in 1

ABOUT KONNWEI

Battery Tester & Relay Tester

KW906 OBD2 Scanner Bluetooth

KW341 Battery Tester

KW340 OBD Scanner

Professional team

ABOUT KONNWEI

Battery Tester & Relay Tester

KW906 OBD2 Scanner Bluetooth

KW341 Battery Tester

KW340 OBD Scanner

Professional team

Learn more about the Detailed Specifications

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info