Active Battery Balancer 4S 5A Lithium Battery Equalizer with Precision Voltage Balancing and Fast Energy Transfer

Active Battery Balancer 4S 5A Lithium Battery Equalizer with Precision Voltage Balancing and Fast Energy Transfer Description

Product overview This active energy transfer balance board provides precision cell equalization for lithium battery packs. It uses capacitive energy transfer to move charge between cells, delivering whole group balance rather than adjacent cell only balancing. Designed for efficient, low loss operation, it is suitable for ternary lithium, lithium iron phosphate, and lithium titanate cells. Key benefits precision cell voltage balance with 5 mV accuracy, keeping cell voltages aligned for more consistent pack performance. Active energy transfer instead of passive dissipation, increasing energy efficiency during balancing. Low standby drain with dormant power off mode drawing less than 0.1 mA, minimizing self discharge when balancing is not required. Scalable equalization current up to 5.5 A, allowing fast redistribution of charge when needed. Robust hardware construction with ultra low internal resistance MOSFETs and 2 oz copper thickness PCB for reliable, low loss current paths. Features and specifications Working voltage range per cell: 1.8 V to 4.5 V Compatible chemistries: ternary lithium, lithium iron phosphate, lithium titanate Equalization current range: 0 to 5.5 A Balance voltage accuracy: within 5 mV for whole pack equalization Energy transfer method: capacitive energy transfer for conversion efficiency Hardware: ultra low internal resistance MOSFETs; PCB with 2 oz copper thickness Dormant switch wiring position provided; dormant mode working current less than 0.1 mA Whole pack equalization design, not limited to adjacent cell balancing How it works Connect the equalization board across the battery pack and the board initiates balancing when voltage differences are detected. Capacitive energy transfer moves charge from higher voltage cells to lower voltage cells across the whole pack. The board uses low resistance MOSFETs and a thick copper PCB to reduce losses and sustain higher equalization currents. Practical applications Solar and energy storage battery banks where cells must remain balanced across many cycles Electric bicycles and mobility devices to improve voltage uniformity across cells in a pack DIY battery packs and prototype energy projects that require active cell balancing and low standby drain Installation notes Ensure per cell voltage stays within the specified working voltage range of 1.8 V to 4.5 V Provide wiring to the reserved dormant switch position if low standby current is required Consider pack configuration and number of cells to estimate practical equalization current per cell, since total equalization current is shared across the pack This active equalizer is intended for users who need precise, efficient balancing across lithium battery packs and a low standby current solution for long term installations.