leagend BC821 — 12V Smart Battery Charger & Battery Tester
Regular price
$84.00 USD
Regular price
$84.00 USD
Sale price
$84.00 USD
Unit price
per
Shipping calculated at checkout.
Overview
leagend BC821 is an 8-step smart 12V battery charger and battery tester designed to help you charge, maintain, and understand your vehicle battery with one easy-to-use device. It supports 12V lead-acid batteries from 1.2Ah to 260Ah and combines automatic charging, battery health testing, cranking-system testing, alternator testing, and battery repair functions in one compact charger.
Whether your car sits unused for long periods, your battery is getting older, or you simply want a reliable way to keep your vehicle ready to drive, leagend BC821 provides intelligent charging and battery maintenance without requiring a separate battery tester.
Key Features
2-in-1 Smart Battery Charger & Battery Tester
- leagend BC821 combines an intelligent battery charger with battery testing functions, giving you more than just a way to recharge your battery.
- 8-step automatic charging for 12V lead-acid batteries
- Battery health testing, including CCA testing
- Vehicle cranking-system testing
- Alternator/charging-system testing
- One device for everyday battery charging and maintenance
8-Step Intelligent Charging
- The 8-step charging cycle automatically manages the charging process to help deliver safe and effective charging for compatible 12V lead-acid batteries.
- leagend BC821 supports WET, MF, Ca/Ca, AGM, and GEL batteries and automatically adjusts the charging process according to battery and operating conditions.
Adjustable 1A / 2A / 4A / 8A Charging
- Choose the charging current that best fits your battery and application:
- 1A — gentle charging and battery maintenance
- 2A — everyday charging
- 4A — faster charging for many automotive batteries
- 8A — maximum charging current for faster battery charging
- The maximum charging current is selectable according to your needs.
Check Battery Health Before You Replace It
- Not sure whether your car battery needs charging or replacing?
- leagend BC821 can test the battery's CCA value and health status, helping you better understand the condition of your 12V lead-acid battery before spending money on a replacement.
Test Your Vehicle's Starting & Charging Systems
- Battery problems are not always caused by the battery itself.
- leagend BC821 can also test:
- Vehicle cranking/starting system
- Alternator/charging system
- Battery performance
- This makes it easier to identify whether a starting problem may be related to the battery or the vehicle's charging system.
One-Touch Shortcut with the Fn Button
- The dedicated Fn shortcut key makes common tasks faster. Set it for a one-key battery quick test or one-key quick charging function, making everyday battery maintenance simple and convenient.
Smart Unattended Mode
- Need to maintain a vehicle while it is parked?
- leagend BC821 features a Smart Unattended Mode designed for long-term connection. In unattended mode, the maximum current is automatically limited to a lower level to support longer-term battery maintenance.
- This is especially useful for vehicles that are stored, driven infrequently, or parked for extended periods.
Battery Repair Mode
- When a compatible lead-acid battery needs additional maintenance, leagend BC821 provides a battery repair mode to help address certain battery conditions.
- It is designed as a maintenance function rather than a guarantee that an aged or damaged battery can be restored.
Automatic Temperature Compensation
- Charging performance can be affected by temperature.
- leagend BC821 incorporates automatic temperature compensation to adjust charging voltage according to ambient conditions, helping provide more appropriate charging in both cold and hot environments.
Built-In Safety Protection
- For greater peace of mind during charging, leagend BC821 includes multiple protection functions:
- Overvoltage protection
- Overcurrent protection
- Overheat protection
- Reverse-connection protection
- Overcharge protection
- Over-discharge protection
- The charger also automatically reduces output power if its temperature becomes too high.
IP65 Water-Resistant Protection
- With an IP65 protection rating, leagend BC821 is designed to better withstand dust and water exposure and can be used in suitable wet environments.
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
1.2-260Ah
Protection Class
IP65
Temperature Compensation
Built-in charging voltage compensation according to ambient temperature
Maximum Charging Current
8A, 4A, 2A, 1A
Max Current of Unattended Mode
4A, 2A, 1A, 0.5A
Reverse Leakage Current
<1.5Ah/month
Couldn't load pickup availability
FAQ
leagend BC821 is a 2-in-1 12V smart battery charger and battery tester. It provides 8-step automatic charging while also allowing you to check battery health, CCA, vehicle cranking performance, and alternator/charging-system performance.
leagend BC821 is designed for 12V lead-acid batteries, including WET, MF, Ca/Ca, AGM, and GEL batteries. It supports compatible battery capacities from 1.2Ah to 260Ah.
Yes. leagend BC821 can test the CCA value and health status of a compatible 12V lead-acid battery. It can also test the vehicle's cranking system and alternator/charging system.
leagend BC821 can operate with a minimum detected battery voltage of 2V. However, a battery that is severely damaged, internally shorted, or otherwise defective may not be recoverable through charging. Battery condition should be evaluated before attempting long-term charging.
leagend BC821 provides selectable charging currents of 1A, 2A, 4A, and 8A, allowing you to choose a suitable charging level for your battery and application.
Yes. leagend BC821 includes a Smart Unattended Mode designed for longer-term connection and battery maintenance. In this mode, the available current is reduced to support unattended charging and maintenance.
leagend BC821 includes a battery repair mode that can help maintain certain lead-acid batteries. However, charging technology cannot restore every damaged or end-of-life battery. A battery with severe physical or internal damage may still need replacement.
leagend BC821 includes overvoltage, overcurrent, overheat, reverse-connection, overcharge, and over-discharge protection. It also incorporates temperature compensation and automatically reduces output power if the charger becomes too hot.
leagend BC821 has an IP65 protection rating and is designed for use in suitable wet environments. However, as with any electrical charger, it should be used according to the operating and safety instructions and should not be submerged in water.
Yes. leagend BC821 includes a vehicle charging-system testing function, helping you determine whether a starting or battery-charging issue may be related to the vehicle's charging system.
Buy now and enjoy exclusive discounts
High-quality products, limited-time special prices, while supplies last
30-day return and exchange
Guaranteed to be genuine
Safe Payment · Privacy Protection
