12V LED Car Battery & Relay Tester – Universal Automotive Tool

Test Your Car Battery & Relays in Seconds

Keep your vehicle running reliably with this Universal 12V LED Indicator Car Battery & Relay Tester. Designed for DIY mechanics and automotive enthusiasts alike, this compact diagnostic tool lets you quickly check your car battery voltage and test electronic relays — no guesswork, no expensive workshop visits. The bright LED indicator gives you an instant, easy-to-read result every time.

Key Features

• Universal Compatibility: Works with most 12V automotive batteries and electronic relays across a wide range of makes and models.
• LED Indicator Display: Bright, colour-coded LED lights provide instant, clear test results — even in low-light conditions.
• No Battery Required: Powered directly from your vehicle's electrical system — no internal batteries to replace or recharge.
• Dual Function: Tests both car batteries AND electronic relays in a single tool, saving space in your toolbox.
• Compact & Portable: Lightweight and easy to store in your glove box, toolkit, or boot for on-the-go diagnostics.
• Easy to Use: Simple plug-and-test operation — no technical expertise required.
• Durable Build: Constructed to withstand the demands of regular automotive use.

What's in the Box?

• 1 × 12V LED Car Battery & Relay Tester

Specifications

• Voltage: 12V
• Type: Universal
• Battery Included: No (vehicle-powered)
• Country of Origin: Made in Mainland China

Why You Need This Tester

A failing battery or faulty relay can leave you stranded at the worst possible moment. Regular testing helps you spot problems early, before they become costly breakdowns. Whether you're a home mechanic, a fleet manager, or just a driver who wants peace of mind, this tool is an essential addition to your automotive kit. Pair it with our other diagnostic tools and accessories:

• 1-In-2-Out HDMI Splitter Cable 1080P 3D – TV Monitor Projector
• 1/2 Channel Tuya WiFi Smart Relay Switch | 16A, Alexa & Google Home

For more information on automotive electrical safety and battery maintenance, visit the U.S. Consumer Product Safety Commission (CPSC) for guidance on safe use of automotive diagnostic tools.

Learn more: Pico Technology

Frequently Asked Questions

Q: Is this 12V car battery tester compatible with all vehicle types?

A: Yes! This is a universal 12V automotive relay and battery tester, making it compatible with most standard cars, trucks, SUVs, and vans that operate on a 12V electrical system. Always confirm your vehicle's voltage before use.

Q: Does the LED car battery tester need batteries to operate?

A: No — this tester does not require any internal batteries. It draws power directly from your vehicle's 12V electrical system, so it's always ready to use without any preparation or charging.

Q: What does the LED indicator show when testing a relay or battery?

A: The colour-coded LED indicator lights up to provide an instant visual reading of your battery voltage or relay status. A positive result confirms the component is functioning correctly, while a negative or no-light result signals a potential fault that needs further investigation.

Q: Can a beginner use this automotive relay tester?

A: Absolutely. This tool is designed for ease of use — simply connect it to your vehicle's battery terminals or relay socket and read the LED result. No technical knowledge or special training is required.