Would this work for a 12v 50 ah battery on ryobi mower? description says "100a load test for 12v batteries; 50a load test for 6v batteries"

The short answer is probably not. The system uses advanced algorithms to test batteries and is designed for specific battery loads which measures internal characteristics of the battery and infers the battery's CCA output and health based on a certain range of battery. Outside that range and the electronic battery tester will be ineffective. Your best bet is to purchase a carbon pile or cheaper resistance type ($25) battery tester for such a small battery. Hope this helps.

Can it be used on agm batteries?

Yes it can use on agm batteries.

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Battery Load Tester 100 Amp 6/12V with Metal Switch

Battery Load Tester 100 Amp 6/12V with Metal Switch

Product ID: 166070547

Details

Brand
Q-Tech
Color
black
Item Weight
2 Pounds
Power Source
Battery
Style
Analog

⚡Tests 6V & 12V batteries up to 1000 CCA

🔋100A load test for 12V batteries

🛠️Heavy duty steel case & metal switch

€ 81.59

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Don’t get stranded—test smarter, drive safer!

BUILT TO LAST - Rugged steel case with enamel finish and metal switch guarantees durability for years of reliable use.
POWERFUL DUAL VOLTAGE TESTING - Seamlessly test both 6V and 12V batteries with up to 1000 CCA capacity—perfect for all your vehicles.
PRECISION ANALOG VOLTAGE METER - Color-coded display ensures quick, accurate readings—no more guesswork during diagnostics.
COMPREHENSIVE SYSTEM DIAGNOSTICS - Beyond batteries—test alternators, regulators, and starter motors to pinpoint electrical issues fast.
COPPER PLATED CLAMPS FOR SUPERIOR CONDUCTIVITY - Vinyl dipped steel clamps with copper jaws deliver consistent, safe connections every time.

The Q-Tech Battery Load Tester FY-41S offers robust 100A load testing for 12V and 50A for 6V batteries, supporting up to 1000 CCA. Its heavy-duty steel construction, metal switch, and copper-plated clamps ensure durability and reliable performance. Featuring a color-coded analog voltmeter, it simplifies diagnostics across cars, trucks, motorcycles, boats, and more—empowering professionals to quickly identify battery and charging system issues with confidence.

Specifications

ASIN	B07T4ZSN3N
Best Sellers Rank	#506,316 in Automotive ( See Top 100 in Automotive ) #311 in Battery Testers
Brand Name	Q-Tech
Color	black
Compatible Devices	6V and 12V vehicle systems, including cars, light trucks, RVs, motorcycles, ATVs, boats, and lawn tractors
Customer Reviews	4.6 4.6 out of 5 stars (452)
Item Dimensions	9.6 x 3.7 x 2.1 inches
Item Weight	2 Pounds
Manufacturer	Q-TECH
Maximum Operating Voltage	16 Volts (DC)
Measurement Type	Voltmeter
Minimum Operating Voltage	6 Volts
Model	FY-41S
Part Number	FY-41S
Power Source	Battery Powered
Style Name	Analog
UPC	844957098020
Unit Count	1.0 Count

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TrustScore 4.5 | 7,300+ reviews

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Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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€ 81.59

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered 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 Cyprus.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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