5A 12V Battery Charger, Tester & Analyzer, Trickle Charger & Desulfator, BC521 4-in-1 Smart Maintainer with Cranking & Alternator Test, 8-Stage Charging, Pulse Repair for Car, RV, Motorcycle

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 Dont replace your dead battery too soon. The battery tester and chargers 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 l voltage for weeks or monthswithout 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 safeguardsover-voltage, over-current, overheating, reverse polarity, overcharge, and over-dischargeprotect 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.