Heltec Active Balancer 3S-21S 5A Capacitive active equalization Active Balancer

Product Overview

The product adopts active balancing technology, using capacitors as carriers to supplement high-energy battery power to low-energy batteries, and energy conversion is carried out within the battery pack to improve the differentiation of battery cells and effectively extend battery life. Its balancing circuit has high efficiency, and the battery charging and discharging process can achieve balancing. The balancing speed is fast, achieving undifferentiated balancing of the entire set. Equipped with sleep function to extend battery life, it can be widely used in various scenarios of series parallel battery pack usage.

Key features

Full-Disk Equalization

Active balancing technology that optimizes energy conversion across the entire battery pack simultaneously.

Achieves voltage balance accuracy up to 5mV, with a minimum balancing voltage difference of 0.01V.
Maximum Balance Current

Can handle a maximum current of 5A when the voltage difference is about 1V, ensuring quick and efficient balancing.

Automatic Low-Voltage Sleep

Stops working and enters sleep mode when the battery voltage falls below 2.7V, protecting the battery from over-discharge.

Technical Specifications

Applicable Battery Type: NCM/LFP/LTO

Voltage Range:1.8V to 4.2V (for NCM/LFP batteries)

Balance Voltage Accuracy: 5mV (typical)

Maximum Balancing Current: 5A (when voltage difference is around 1V)

Minimum Balance Voltage Difference: 0.01V

Static Operating Current: 13mA

Undervoltage Protection (Sleep Mode): 2.7V

Operating Temperature Range: -10°C to 60°C

External Power Supply: Not required (powered by the internal battery energy)

Single String Voltage Range: 2V to 5V

Measurement Accuracy: 0.5% or ±5mV