Where can I buy another load test switch for the unit?

Any auto parts store, NAPA, O’RIELLYS, Auto Zone. You may have to order it. Oh and Harbor Freight.

Wll this load-test a disconnected battery?

Hello, Thanks for reaching out. The Neiko 40510A Car Battery load tester is designed for this purpose. Please see user manual for detailed step by step instructions. If you have any additional questions/concerns please feel free to reply to this message below.

My boat battery is little over 13 volt. Can it be tested using this device?

Yes. Most fully charged 12 volts will show 13 volts. It is a great little tester and works well. (golf cart batteries)

40510a Car Battery Tester 100 Amp 6 And 12 Volt

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

🔧 Power up your diagnostics with confidence — don’t get caught off-guard!

RAPID DIAGNOSTICS - Perform up to 3 load tests within 5 minutes with a simple 10-second load hold and cooldown cycle.
USER FRIENDLY CLAMPS - Color-coded copper clamps with rubber grips ensure safe, quick, and correct terminal connections.
PRECISION LOAD TESTING - Simulates real starter motor draw with a 100 AMP load for accurate battery health insights.
VERSATILE COMPATIBILITY - Effortlessly tests 6V and 12V batteries across cars, trucks, motorcycles, boats, and RVs.
RUGGED PORTABLE DESIGN - Protected analog meter and anti-spark switchgear housed in a compact, easy-carry frame.

The Neiko 40510A Car Battery Tester delivers reliable, professional-grade load testing for 6V and 12V automotive batteries up to 1000 CCA. Featuring a fixed 100 AMP load current, rugged copper clamps, and a protected analog meter, it’s designed for mechanics and DIYers seeking quick, accurate battery health checks across a wide range of vehicles.

Specifications

ASIN	B07B3R4TS6
Best Sellers Rank	#15,343 in Automotive ( See Top 100 in Automotive ) #133 in Automotive Battery Testers
Brand Name	Neiko
Color	Black
Customer Reviews	4.4 4.4 out of 5 stars (3,761)
Included Components	Battery Tester
Item Type Name	Car Battery Tester \| 100 AMP 6 and 12 Volt Automotive Load Checker \| CCA Analyzer
Manufacturer	Neiko
Measurement Type	Ammeter
Minimum Operating Voltage	6 Volts
Model	40510A
Power Source	Corded Electric
Style Name	Car Battery Tester
UPC	816914021488

Reviews

K**D

I didn't like it

I didn't like it not accurate

20.07.2024

R**.

Very cheap materials

Very cheap materials. Bad quality

1.12.2020

S**D

Original & Good Quality

all good

8.04.2024

A**L

Excelente si tienes taller o eres hobbista

17.02.2024

G**K

Great price for the job it does.

3.03.2024

L**W

Works as stated. I have two of them, one at lake , one at home. Great way to check on the viability of car/ boat batteries. Worth every penny!

7.07.2025

D**.

Fácil de usad

29.08.2020

D**K

Works great

6.12.2025

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TrustScore 4.5 | 7,300+ reviews

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