FOXWELL BC521 4-in-1 Battery Charger & Tester 5A 12V Smart Battery Maintainer & Trickle Charge, Cranking/Alternator Analyzer, 8-Stage Charging, Battery Repair, IP65 Waterproof for Car/RV/Motorcycle

Test Your Battery Before Charge Stop guessing, know the condition before charging! More than a charger, BC521 is also a true 12V battery tester that tells you the batterys real condition before you waste time charging. It checks voltage, SOH, SOC, internal resistance, cranking performance, and alternator status with 99.9 % accuracy. Clear LCD results instantly show whether your battery needs charging, repair, or replacement helping you avoid unnecessary charging or unexpected breakdowns.
Bring Sleeping Batteries Back to Life Dont replace your battery too soon. This smart battery maintainer uses Maintainer Mode to save batteries you thought were dead, recovering deeply discharged and sulfated batteries that have sat unused for weeks or months restoring lost capacity and extending battery life. Once fully charged, this trickle charger automatically switches to Unattended Mode. No need to unplugmaintain optimal voltage to keep your battery fully charged at all times. Ideal for spare cars, RVs, motorcycles, boats, and seasonal vehicles.
Easy for Anyone to Use Designed for everyday drivers, not just professionals. The clear LCD and LED indicators show charging status and battery health at a glance without guessing. One-touch FN hotkey recalls your last charging mode (Quick Charging) or runs a Battery Test instantly, saving time on repeated tasks. Review past charging and test history to track battery performance over time. Plus, it's clear instructions will make setup fast and frustration-free.
Built-In Safety & Outdoor Durability Set it and walk away with confidence. This automotive battery charger has 6 safeguardsover-voltage, over-current, overheating, reverse polarity, overcharge, and over-dischargeto eliminate spark risks and protect both you and your battery during unattended charging. IP65 waterproofing and Flame-retardant housing ensure safe use indoors or outdoors. Temperature compensation adjusts voltage in extreme heat or cold, keeping your battery healthy year-round.