8.4V Li-ion Battery Charger: Accurate Time, Efficient Empowerment

Designed for two series (2S) 8.4V Li-ion batteries (single 4.2V), the charger greatly shortens the charging time while ensuring battery safety with intelligent fast charging technology and precise control algorithm, becoming an efficient power supply solution for power tools, energy storage equipment, portable electronics and other fields.

Extremely fast charging: a perfect balance between time and safety

Core parameters & charging time calculation

Typical configuration: compatible with 2S 8.4V Li-ion batteries (capacity range 1000mAh - 5000mAh), supports 1A - 3A adjustable charging current (default 2A).
Charging time formula: Charging time (hours) = battery capacity (mAh) ÷ charging current (mA) + 0.5 hours (constant voltage charging and protection time)
Example 1: 2000mAh battery + 2A charging = 1.5 hours (1 hour in constant current stage, 0.5 hours in constant voltage charging)
Example 2: 4000mAh battery + 3A charging = 1.8 hours (supports high current fast charging models)
Intelligent 2-stage charging technology
Constant current fast charging stage (0% - 80%): fast charging with the maximum set current, significantly shortening the main charging time;
Constant voltage slow charging stage (80% - 100%): automatically switch to 4.2V×2 constant voltage mode to replenish power with decreasing current to avoid overcharging and extend battery life.
Intelligent current control: reject false labeling and accurately protect battery health
Three core advantages
Overcharge protection mechanism: when the voltage of a single battery reaches 4.2V±0.02V, it automatically enters trickle mode, and the power is cut off within 10 minutes after full charge. The charging completion accuracy reaches 99.8%, which reduces the risk of overcharge by 30% compared with traditional chargers.
Temperature dynamic adjustment: built-in NTC temperature sensor, when the battery temperature exceeds 55°C, the current is automatically reduced to 1A; when it exceeds 65°C, charging is suspended, and the temperature is restored after it drops back to the safe range (20°C - 45°C), ensuring that the charging time is controllable and safe in high temperature environment.
Reverse connection/short circuit protection: supports battery reverse connection recognition, and quickly fuses within 0.5 seconds when misconnected, avoiding charging time delays or equipment damage caused by wiring errors.
Scenario-based time efficiency solution: adapt to multiple needs
Industrial-grade power tools (such as electric drills and lawn mowers)
Pain point: urgent need to recharge between operations, traditional chargers take too long to affect efficiency.
Solution: Choose a 3A fast charging model, a 4000mAh battery only takes 1.5 hours to charge to 80%, meeting emergency operation needs; automatically enters sleep mode after full charge, standby power consumption <0.1W, avoiding no-load power consumption.
Portable energy storage equipment (such as outdoor power supplies, drones)
Pain point: charging multiple devices at the same time leads to uneven power distribution, affecting overall time efficiency.
Solution: Unique intelligent power distribution technology, supports independent current control of each channel during parallel charging, and when multiple groups of 8.4V batteries are charged at the same time, the time error of a single group is <5%, ensuring consistent batch charging efficiency.
Technical parameter comparison: highlight the advantages with data
Project
Traditional charger
Our 8.4V lithium battery charger
Improvement
2000mAh charging time
2.5 hours
1.5 hours
40%
Overcharge protection response time
5 minutes
10 seconds
96.7%
High temperature charging current reduction accuracy
±0.5A
±0.1A
80%
Customized time-limited solution: meet the needs of special scenarios
Low temperature environment (-10°C): support preheating mode, activate the battery with a small current of 0.5A 5 minutes before charging to avoid prolonged charging time caused by low temperature;
Pulse charging mode (optional): for aging batteries, eliminate polarization effects by periodically stopping charging, shorten charging time by 15% compared with conventional mode, and increase battery cycle life to more than 800 times.
Core selling points of foreign trade copywriting
Extremely fast charging: Under 2A current, a 2000mAh battery only takes 1.5 hours to be fully charged, meeting the emergency power replenishment needs of industrial-grade equipment;
Precise time control: Intelligent 2-stage charging, 80% ultra-fast charging before, and constant voltage precision charging after 20%, with a charging completion accuracy of 99.8%;
Full-scenario adaptation: supports 1A-3A current regulation, adapts to 1000mAh-5000mAh batteries, and has stable time efficiency without large fluctuations in high and low temperature environments;
Safety escort: Overcharge/overtemperature/reverse connection protection response time <1 second, while the charging time is controllable, the battery life is extended by more than 20%.
Call for action
Whether it is the efficient operation of power tools or the stable battery life of energy storage equipment, our 8.4V lithium-ion battery charger has become your reliable choice with its precise time efficiency and safety performance.
Contact us now to get customized charging time solutions and sample testing, so that every second counts when recharging!

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