2Pcs 3S 4S 5S 100A Lithium Battery Protection Board BMS Module, Smart Balance Charging, Reliable Circuit Protection

2 pieces of protection circuit boards for 3S, 4S, and 5S lithium battery packs. Designed for cells with a nominal voltage of 3.7V per cell, supporting pack voltages of approximately 12V, 16.8V, and 21V. Rated for continuous discharge currents up to 100A. Compatible with LiIon, LMO, and LiPolymer chemistries. 2026 design for reliable electronic component performance. Key benefits Protects battery packs during charge and discharge by managing individual cell voltages and current flow. Integrated balance charging maintains equal cell voltage during charging to improve usable capacity and reduce imbalancerelated issues. 100A current rating supports drain applications where stable discharge performance is required. Pack of two boards lets you equip multiple battery packs or keep a spare for maintenance and replacements. Compact PCB format for straightforward installation into custom battery assemblies. Function and performance Protection functions include overcharge and overdischarge control, and overcurrent limiting to help prevent harmful operating conditions. Passive cell balancing supports stable charging across 3S, 4S, and 5S configurations. Designed for use with nominal 3.7V cells, matching standard lithium chemistry voltages and common pack configurations. Compatibility Supports 3S, 4S, and 5S packs with nominal pack voltages of 12V, 16.8V, and 21V. Suitable for LiIon, LMO, and LiPolymer battery types. Fits applications that require the same mouth terminal arrangement as the original board. Typical applications Remote control models and hobby electronics that use 3S to 5S LiPo packs and need reliable pack protection and balancing. DIY battery packs for portable LED lighting, power tools, and backup power modules where stable charging and discharge control are required. drain custom builds such as small electric vehicles, electric skateboards, or power platforms that operate within the supported voltage and current range. What you get Two identical protection circuit boards, each specified for 3S to 5S operation and 100A continuous current. A straightforward component for integrating balance charging and protection into lithium battery assemblies. Notes Verify cell chemistry and pack configuration before installation. Ensure wiring and connectors match the board terminal layout prior to final assembly.