4S 5A Active Balancer - LiFePO4/Li-ion Cell Equaliser

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4S 5A Active Balancer: Precision Cell Equalisation for LiFePO4 and Li-ion Battery Packs Maintain Peak Battery Performance with Capacitive Energy Transfer Balancing The 4S 5A Active Balancer is a high-efficiency battery equaliser designed to keep your LiFePO4 or Li-ion cells in perfect balance. By actively transferring energy from higher-voltage cells to lower-voltage cells, it maximises usable capacity, extends cycle life, and prevents premature failure caused by cell imbalance. This module is an essential component for anyone managing 3S or 4S lithium battery banks in caravans, RVs, marine systems, solar storage, or off-grid power setups. Unlike passive balancing boards that waste excess energy as heat, this active balancer uses a capacitive energy transfer method to redistribute charge efficiently across the entire pack simultaneously. The result is faster balancing, less energy loss, and cooler operation, even under continuous use. Why Active Balancing Matters for Lithium Batteries In series-connected lithium battery packs, slight differences in cell capacity, internal resistance, or temperature can cause voltage drift over time. Without balancing, the weakest cell limits the entire pack's performance, leading to reduced runtime, premature low-voltage cutoffs, and accelerated degradation. An active cell balancer like this unit continuously corrects these imbalances, ensuring every cell reaches full charge and discharges evenly. This is particularly critical for lithium iron phosphate (LiFePO4) batteries, which have a very flat voltage curve and require precise balancing to maintain state-of-charge accuracy. Key Features 5.5A peak balancing current dynamically adjusts based on voltage difference, delivering rapid equalisation for large capacity packs (60-300Ah recommended) Capacitive energy transfer technology shifts charge between all cells simultaneously, minimising energy loss and heat generation Ultra-precise balancing with voltage accuracy within 5mV, ensuring optimal cell matching and maximum pack capacity Wide compatibility with ternary lithium (NMC), lithium iron phosphate (LiFePO4), and lithium titanate (LTO) chemistries across a 2.7V-4.2V working range Under-voltage sleep protection automatically puts the balancer into a low-power state ( Show more