About This

• 4-in-1 Versatile Battery Doctor — Why buy multiple tools that still wear out fast? FOXWELL, trusted by professionals for over 15 years, builds tools that last — The FOXWELL BC521 combines a charger, tester, maintainer, and desulfator in one durable, smart device — saving you 200+ in tools and replacements, keeping your space tidy. It charges, diagnoses, and restores 12V lead-acid batteries (AGM, GEL, EFB, Flooded), so your car, motorcycle, RV, or boat still starts reliably after weeks of sitting or in cold weather.
• Smart 8-Stage Charging for Longer Life — Standard trickle chargers only push power blindly. This car battery charger uses an advanced 8-stage charging system—including Desulfation, Soft Start, Float, and Pulse Repair—to charge smarter and protect your battery at every step. Choose from 5A/3A/1A modes to match your battery size and charging needs. Built-in temperature control prevents overheating or overcharging, so your battery stays healthy, powerful, and always ready when you need it.
• Test Before You Charge with 99.9% Accuracy — More than just a charger, BC521 is a true 2-in-1 battery tester and smart charger, giving you accurate diagnostics before any charging begins. It quickly checks voltage, SOH, SOC, internal resistance, cranking performance, and alternator status. Clear, real-time LCD results show whether your battery needs a charge, repair, or replacement — saving you hours of guesswork and helping prevent unexpected roadside breakdowns.
• Bring Sleeping Batteries Back to Life — Don’t replace your dead battery too soon. The battery tester and charger’s Maintainer Mode automatically restores deeply discharged and sulfated batteries, recovering lost capacity and saving costly replacements. Once fully charged, this car battery maintainer automatically switches to Unattended Mode, keeping batteries at optimal voltage for weeks or months—without unplugging. Ideal for cars, RVs, motorcycles, and boats left in long-term storage.
• Built-In Safety & Outdoor Durability — Your safety comes first. This automotive battery charger has 6 safeguards—over-voltage, over-current, overheating, reverse polarity, overcharge, and over-discharge—protect your battery safely. Flame-retardant housing and IP65 waterproofing ensure safe use indoors or outdoors. Temperature compensation adjusts voltage for hot or cold weather, keeping your battery healthy year-round.
• Easy for Anyone to Use — Clear LCD and LED indicators show charging and test results at a glance. One-touch FN hotkey recalls your last charging mode or runs an instant Battery Test. Review past charging and test history to monitor performance over time. Includes clear, easy-to-follow instructions that make setup simple even for first-time users.

Overview

• Brand : FOXWELL
• Color : Black
• Output Voltage : 12 Volts (DC)
• Specification Met : UL, CE, FCC, IEC
• Current Rating : 5 Amps