ANCEL BT521 3-in-1 Smart Car Battery Charger, Tester & Maintainer

The ANCEL BT521 is a powerful all-in-one smart battery solution that combines charging, testing, and maintaining functions in a compact and easy-to-use device. Designed for 12V lead-acid batteries, it is perfect for automotive professionals, DIYers, and anyone looking to extend the life of their batteries.

🔋 3-in-1 Functionality for Maximum Efficiency

• Charger: Equipped with advanced 8-stage charging technology, it revives deeply discharged batteries down to 2V.
• Tester: Smart chip with alligator clips provides over 99.6% testing accuracy.
• Maintainer: High-frequency pulses break down lead sulfate crystals to restore and enhance battery capacity.

⚡ Smart Battery Charging Technology

Unlike basic trickle chargers, the BT521 uses intelligent 8-stage charging to stabilize output with minimal heat and ripple. This protects battery health, reduces wear, and extends lifespan. Ideal for restoring old batteries and maintaining new ones.

🔍 Advanced Battery Testing Features

• Instantly checks State of Health (SOH), voltage, current, and internal resistance.
• Minimizes false readings with precision components.
• Allows early detection of issues to prevent vehicle downtime.

🔧 Maintenance & Desulfation Capabilities

The built-in maintenance mode helps clear buildup and restore electrode activity—improving battery capacity by up to 90%. Regular use can extend battery lifespan by 2–3 times and reduce replacement costs.

🛡️ Comprehensive Safety Protection

• Temperature compensation chip adjusts charging from -25°C to 75°C.
• 5-level safety protection: reverse connection, over-voltage, over-current, short-circuit, and overheating.
• Durable flame-retardant construction ensures safety in tough environments.

📊 User-Friendly LCD Display

The large LCD screen clearly displays real-time voltage, charging progress, and battery health. The plug-and-play design requires no pre-calibration—simply connect and the system starts in 3 seconds.

🔌 Wide Compatibility

Works with all 12V lead-acid batteries including AGM, GEL, SLA, Flooded, Deep Cycle, and Marine. Compatible with a wide range of vehicles and machines:

• Cars, Motorcycles, ATVs, RVs, SUVs
• Boats, Lawn Mowers, Trailers, Mopeds
• Classic Cars, Marine Equipment, and more

📦 Product Specifications

• Brand: ANCEL
• Model: BT521
• Current: 5A
• Display: LCD Screen
• Dimensions: 11.1 x 7.4 x 3.6 inches
• Binding: Electronics

✅ What’s Included

• ANCEL BT521 3-in-1 Battery Charger
• Heavy-duty alligator clips
• User Manual

🔧 Installation Support

Step-by-step instructions are included. Our support team is available to help you get set up quickly and safely.

⚠️ Important Notice

Ensure compatibility with your battery type before use. Always follow safety guidelines during operation.