BC521
BC521
BC521
BC521
BC521
BC521
BC521
BC521

leagend BC521 12V Smart Battery Charger & Battery Tester

$150.98 USD
$64.80 USD $150.98 USD
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Overview

leagend BC521 is a smart 12V battery charger and battery tester that helps you charge, test, maintain, and monitor your vehicle battery with one device. Its fully automatic 8-step charging system supports multiple 12V lead-acid battery types, while built-in battery, cranking-system, and alternator tests help you understand your vehicle's battery condition before problems leave you stranded.

Whether you're maintaining a daily driver, motorcycle, boat, RV, or another vehicle with a 12V lead-acid battery, leagend BC521 makes everyday battery care simpler, smarter, and more convenient.

Key Features

2-in-1 Smart Battery Charger & Battery Tester

  • Why use separate tools when one device can do both?
  • leagend BC521 combines a smart 12V battery charger with battery and vehicle electrical-system testing. Check your battery's CCA and health status, test the vehicle's cranking system and alternator system, and charge the battery using the same device.

8-Step Fully Automatic Charging

  • The intelligent 8-step charging cycle automatically manages the charging process to help deliver controlled and efficient charging.
  • Once connected, leagend BC521 can automatically progress through the charging cycle without requiring constant attention.
  • It supports charging currents of 1A, 3A, or 5A, allowing you to choose the charging speed according to your battery and situation.

Test Battery Health Before You Replace It

  • A battery that won't start your vehicle isn't always simply "dead."
  • leagend BC521 can test the battery's CCA and health status, helping you better understand whether the battery needs charging, maintenance, or replacement.
  • This makes it easier to avoid replacing a battery before you actually need to.

Check Your Vehicle's Cranking & Charging Systems

  • Battery problems can sometimes come from the vehicle's electrical system.
  • With leagend BC521, you can also test the cranking system and charging system, giving you more information when troubleshooting starting or charging problems.

One-Key Quick Test & Quick Charging

  • The dedicated Fn shortcut key can be configured for one-key battery testing or one-key quick charging.
  • Get the function you need without navigating complicated menus every time.

Smart Unattended Charging

  • Need to maintain a vehicle that sits for extended periods?
  • leagend BC521 offers a smart unattended charging mode designed for long-term connection. The maximum unattended-mode current can be set to 0.5A, 1.5A, or 2.5A, helping maintain the battery while reducing the need for frequent monitoring.

Battery Repair Mode

  • leagend BC521 includes a battery repair mode designed to help maintain and potentially improve the condition of compatible lead-acid batteries.
  • It can be especially useful when you're trying to maintain a battery that has experienced extended periods of inactivity.

Smart Temperature Management

  • Battery charging performance can be affected by temperature.
  • leagend BC521 includes automatic temperature compensation and adjusts charging voltage according to ambient temperature. It also reduces output power when the charger's temperature becomes too high.
  • This helps provide more controlled charging across changing environmental conditions.

Built-In Safety Protection

  • For everyday charging confidence, leagend BC521 incorporates multiple protection functions, including:
  • Overvoltage protection
  • Overcurrent protection
  • Overheat protection
  • Reverse-connection protection
  • Overcharge protection
  • Over-discharge protection

IP65 Water-Resistant Design

  • With an IP65 protection rating, leagend BC521 is designed to handle demanding everyday environments and can be used in wet conditions when used according to the product instructions.

Wide 12V Lead-Acid Battery Compatibility

  • leagend BC521 supports a wide range of 12V lead-acid batteries, including:
  • WET batteries
  • MF batteries
  • Ca/Ca batteries
  • AGM batteries
  • GEL batteries
  • It supports batteries from 1.2Ah to 160Ah, making it suitable for many personal vehicles and recreational applications.

Specifications

Input
100~240V-AC/50-60Hz
Charging Voltage
①:
14.4V, ②:
14.7V, ③:
15.8V, ④: Float 13.6V
Minimum Battery Voltage
2V
AC Input Current
1.25A rms (At maximum charging current)
Ripple
<4%
Working Temperature
-20℃~70℃ (-4℉~158℉)
Safety
overvoltage protection, overcurrent protection, overheat protection, reverse connection protection, anti-overcharge, anti-overdischarge
Charging Type
8-step, fully automatic charging cycle
Battery Type
All types of 12V lead-acid batteries (WET, MF, Ca/Ca, AGM and GEL)
Battery Capacity
1.2-160Ah
Protection Class
IP65
Temperature Compensation
Built-in charging voltage compensation according to ambient temperature
Maximum Charging Current
5A, 3A, 1A
Max Current of Unattended Mode
2.5A, 1.5A, 0.5A
Reverse Leakage Current
60mA/h
Color: Black

FAQ

leagend BC521 is designed for 12V lead-acid batteries, including WET, MF, Ca/Ca, AGM, and GEL batteries. It supports battery capacities from 1.2Ah to 160Ah.
It is both. leagend BC521 is a 2-in-1 12V smart battery charger and battery tester. It can charge compatible 12V lead-acid batteries while also testing battery CCA and health, as well as the vehicle's cranking and alternator systems.
You can select between 1A, 3A, and 5A charging currents. The appropriate setting depends on your battery and charging requirements.
Yes. leagend BC521 supports 12V AGM batteries, as well as WET, MF, Ca/Ca, and GEL lead-acid batteries.
Yes. leagend BC521 can test battery CCA and health status, helping you determine whether a battery may need charging, maintenance, or replacement.
Yes. leagend BC521 can test the vehicle's charging system, as well as the cranking system. These tests can provide additional information when diagnosing starting or charging problems.
leagend BC521 includes a smart unattended charging mode designed for long-term connection and battery maintenance. Always follow the product manual and safety instructions for your specific battery and vehicle.
Yes. leagend BC521 includes a battery repair mode designed for compatible lead-acid battery maintenance.
leagend BC521 has an IP65 protection rating and is designed for use in wet environments. However, IP65 does not mean the charger should be submerged or intentionally exposed to excessive water.
The minimum battery voltage specified for leagend BC521 is 2V.
Yes, provided the battery is a compatible 12V lead-acid battery within the 1.2Ah–160Ah capacity range. This makes leagend BC521 suitable for many cars, motorcycles, boats, RVs, and similar vehicles.
A standard battery charger primarily focuses on charging. leagend BC521 combines charging with battery testing, cranking-system testing, charging testing, battery repair mode, and long-term maintenance functions, giving you more information and control over your vehicle's battery care.;Besides, it has its unique 8-step charging technology and unattached mode.

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