12V Car Battery Charger & Tester, FOXWELL BC521 5A Smart 4-in-1 Maintainer, Restore Weak Batteries, Trickle Charger with Cranking & Charging System Test, Pulse Repair for Car/RV/Motorcycle/Lawn Mower

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Product details

Management number	211804249	Release Date	2026/04/04	List Price	$36.00	Model Number	211804249
Category	Automotive Tools & Equipment Jump Starters, Battery Chargers & Portable Power Battery Chargers

4-in-1 Battery Charger, Tester, Maintainer & Desulfator — Why spend $200+ on multiple tools? Trusted by professionals for over 17 years, FOXWELL BC521 combines smart battery charging, testing, maintenance, and desulfation in one durable, space-saving device. Designed for all 12V lead-acid batteries (AGM, GEL, EFB, Flooded), it helps ensure reliable starts for cars, SUVs, ATVs, motorcycles, RVs, boats and lawn mower— perfect for waking up vehicles after winter storage as spring arrives. Not compatible with lithium, 6V, or 24V batteries. Not a Jump Starter.
Maximize Battery Life with Smart 8-Stage Charging — Stop "force-feeding" your battery with basic 2-3 stage chargers that can overheat and damage cells. The BC521 smart charger uses a precise 8-stage charging cycle that automatically manages everything from desulphation to pulse maintenance. It gives your battery exactly what it needs to stay at 100%, so you never have to worry about "cooking" or frying your cells. Just plug it in and let the 8-step logic do the work—all season long.
Know Your Battery Health Before Charge with 2-in 1 Charger & Tester— Don't waste hours charging a dead battery that’s already failed. Unlike standard chargers, BC521 acts as a professional 12V car battery tester, giving you instant LCD data on Voltage, SOH (State of Health), SOC, Cranking Performance and Alternator Output. This digital battery analyzer tells you exactly if your battery is ready for a spring road trip or if it’s time for a replacement—saving you from unexpected breakdowns and expensive towing fees.
Revive Old Batteries & Keep Seasonal Vehicles Fully Charged — Worried about a dead battery after winter storage? Maintainer and repair functions help reduce sulfation and slow battery aging, perfect for waking up motorcycles, RVs, and boats as spring arrives. Once fully charged, the smart charger automatically enters Unattended Mode to maintain optimal voltage, keeping your seasonal vehicles ready for that first spring trip without draining the battery.
Built-In Safety & Outdoor Durability — Designed for worry-free unattended charging, this automotive battery charger and tester helps protect both you and your battery from common risks like sparks, overcharging, and overheating. With 6 built-in protections, an IP65 waterproof rating, and a flame-retardant housing, it’s safe to use both indoors and outdoors, even in challenging conditions.
Easy for Anyone to Use — Designed for everyday drivers, not just professionals. A clear LCD with LED indicators shows charging status and battery health at a glance, with no guessing required. A one-touch FN button simplifies charging and testing, while built-in history lets you review past results — making setup fast, simple, and frustration-free.

Brand	FOXWELL
Color	Black
Amperage	5 Amps
Manufacturer	FOXWELL
Model Number	BC521
BuiltIn Media	BC521 host, manual, case
Input Voltage	120 Volts (AC)
Current Rating	1.25 Amps
Output Voltage	12 Volts (DC)
Mfr Part Number	FOXWELL BC521 Battery Charger and Tester
Number of Ports	1
Specification Met	UL, CE, FCC, IEC
Item Dimensions D x W x H	7"D x 11.22"W x 3.5"H
Connector Type Used on Cable	100-240V~AC/50-60Hz