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3PCS 1S LiFePO4 / Lithium Battery Protection Board BMS 12A–24A with Short Circuit and Overcharge Protection

$14.08 USD

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1S BMS Battery Protection Board — LiFePO4 & Li-ion, 12A / 16A / 24A, 3-Pack

A precision-engineered 3-piece set of single-cell (1S) Battery Management System (BMS) protection boards, available in both LiFePO4 (3.2V) and standard lithium-ion / LiPo (3.7V) chemistry variants. Each board integrates overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection on a compact PCB — making it the essential safeguard for any single-cell lithium battery application.

Designed for engineers, makers, and product developers who need reliable cell-level protection without the complexity of multi-cell BMS systems. The low-profile board fits directly onto 18650, 26650, LiFePO4 prismatic, and pouch cells, and is compatible with standard charge/discharge wiring configurations.

Variant Selection Guide

Variant	Chemistry	Nominal Voltage	Continuous Current	Overcharge Cutoff	Over-discharge Cutoff
1S 12A 3.2V LiFePO4	LiFePO4	3.2V	12A	3.65V	2.5V
1S 16A 3.2V LiFePO4	LiFePO4	3.2V	16A	3.65V	2.5V
1S 24A 3.2V LiFePO4	LiFePO4	3.2V	24A	3.65V	2.5V
1S 12A 3.7V Lithium	Li-ion / LiPo	3.7V	12A	4.25V	2.75V
1S 16A 3.7V Lithium	Li-ion / LiPo	3.7V	16A	4.25V	2.75V
1S 24A 3.7V Lithium	Li-ion / LiPo	3.7V	24A	4.25V	2.75V

Protection Functions & Electrical Specifications

Overcharge Protection: Cuts off charge MOSFET when cell voltage exceeds the chemistry-specific threshold (4.25V for Li-ion; 3.65V for LiFePO4). Automatically resets when voltage drops below recovery threshold.
Over-discharge Protection: Disconnects load path when cell voltage falls below the minimum safe level (2.75V for Li-ion; 2.5V for LiFePO4), preventing irreversible capacity loss and cell damage.
Overcurrent / Short-Circuit Protection: Detects abnormal current spikes and disconnects output within microseconds. Protects both the cell and downstream circuitry from thermal runaway and weld damage.
Operating Temperature: –20°C to +60°C (charge); –40°C to +60°C (discharge)
Quiescent Current: <5µA (sleep mode, over-discharge triggered)
Internal Resistance: ≤30mΩ (typical, at rated current)
PCB Dimensions: Approx. 47 × 8 × 1.5mm (may vary slightly by variant)
MOSFET Configuration: Dual N-channel MOSFET (charge + discharge control)

Application Scenarios

DIY 18650 Power Banks: Protect single 18650 Li-ion cells in custom power bank builds. The 12A variant handles standard USB-C PD charging; the 24A variant supports high-drain applications.
LiFePO4 Solar Storage Cells: The 3.2V LiFePO4 variants are ideal for single-cell solar energy storage nodes, 12V LiFePO4 battery pack sub-modules, and off-grid sensor nodes requiring long cycle life (>2000 cycles).
RC Models & Drones: Single-cell LiPo protection for low-power RC receivers, servo testers, and FPV camera power rails where a full multi-cell BMS is unnecessary.
IoT & Embedded Systems: Protect single-cell battery packs in ESP32, Arduino, and Raspberry Pi Pico projects. The low quiescent current (<5µA) ensures minimal standby drain in sleep-mode applications.
Portable LED & Flashlight Builds: High-drain 16A/24A variants support direct-drive LED configurations and high-lumen flashlight builds using single 18650 or 26650 cells.
E-bike Accessory Packs: Protect auxiliary single-cell packs used for lights, GPS trackers, and control electronics in e-bike systems.
Medical & Industrial Prototyping: Suitable for low-voltage single-cell prototypes requiring stable, protected power rails in R&D environments.

Wiring & Integration Notes

Standard 4-pad layout: B+ (battery positive), B− (battery negative), P+ (load/charger positive), P− (load/charger negative)
Compatible with both common-port and separate-port charge/discharge configurations
Solder pads accept 20–26 AWG wire; use flux-core solder for clean joints on the nickel-plated pads
No external components required — protection IC and MOSFETs are pre-mounted and calibrated
Can be heat-shrink wrapped or mounted with double-sided tape for compact pack assembly

Why Choose a Dedicated 1S BMS?

Many DIY builders rely on bare cells without protection, risking overcharge, deep discharge, and short-circuit damage that permanently degrades capacity or causes thermal events. A dedicated 1S BMS adds less than 1g of weight and costs a fraction of a replacement cell — making it the most cost-effective safety upgrade for any single-cell lithium project.