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Product Description
The BMS 1S 3A 3.7V 2-MOS Lithium Battery Protection Board is a compact, high-precision safety module designed for single-cell (1S) 3.7V lithium-ion and lithium-polymer (LiPo) batteries, including standard 18650 cells and flat polymer pouches. Featuring a dual MOSFET (2-MOS) switching design, this protection circuit delivers stable continuous discharge currents up to 3A while safeguarding your battery against overcharging, deep discharge, over-current, and short circuits.
Pre-fitted with spot-welded nickel strips, this module allows direct, hassle-free soldering to 18650 battery terminals or pouch cell tags without requiring extra nickel tabs or specialized spot-welding tools.
⚠️ Soldering Tip: Solder quickly when attaching wires or soldering the nickel tabs directly to battery terminals to avoid transferring excessive heat into the battery cell casing. Double-check output polarity before connecting to chargers or load devices.
Technical & Architectural Highlights
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Pre-Attached Nickel Strips: Comes with pre-welded nickel tabs for fast, direct attachment to 18650 cells and LiPo battery contacts.
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Dual MOSFET (2-MOS) Driver: High-efficiency 2-MOS design provides lower internal resistance and stable 3A continuous discharge.
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Precision Voltage Monitoring: Integrated IC constantly monitors cell status to prevent overcharge damage (cut-off ~4.25V) and deep discharge (cut-off ~2.5V).
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Ultra-Compact Form Factor: Fits seamlessly across the top cap of standard 18650 cells or inside slim polymer pouch battery packs.
🧰 Recommended Batteries & Power Accessories
Completing your single-cell battery setup or charger assembly? Add these matching batteries and power management essentials to your order:
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Lithium Protection Boards (BMS): Explore various single-cell and multi-series BMS configurations for custom battery packs: Pro Tronix BMS Modules Collection
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1S Lithium Battery Charger Modules (TP4056): Dedicated 5V USB Type-C and Micro-USB charging boards designed for 3.7V single-cell lithium batteries: Pro Tronix 1S Charger Collection
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18650 & Cylindrical Lithium-Ion Batteries: High-capacity rechargeable cells ideal for building single and multi-cell battery packs: Pro Tronix Lithium Batteries Collection
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Lithium Polymer (LiPo) Batteries: Ultra-thin soft-pouch cells for compact electronics, wearables, and IoT sensors: Pro Tronix LiPo Batteries Collection
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Battery Holders & Nickel Strips: Secure 18650 battery holders, clips, and extra nickel strips for clean pack assembly: Pro Tronix Battery Holders Collection
Technical Specifications
| Parameter | Value / Specification |
| Battery Chemistry | Single-Cell Li-ion / LiPo / 18650 (3.6V / 3.7V nominal) |
| Series Configuration | 1S (1 Cell) |
| Nominal Voltage | 3.7 V |
| Full Charging Cut-Off Voltage | 4.25V ± 0.05V |
| Over-Discharge Cut-Off Voltage | 2.50V ± 0.08V |
| Continuous Discharge Current | Max 3 A |
| MOSFET Configuration | 2-MOS Dual Switch |
| Terminal Connection | Integrated Pre-Welded Nickel Strips |
Applications
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18650 Cell Protection Retrofit: Adding essential BMS protection to unprotected standard 18650 lithium cells.
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Single-Cell LiPo Pouch Packs: Safe power delivery for portable Bluetooth gadgets, wearables, and micro-drones.
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DIY IoT & Wearable Electronics: Compact 3.7V power management for ESP32/ESP8266 remote sensor nodes.
What’s in the Box
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1 x BMS 1S 3A 3.7V 2-MOS Lithium Battery Protection Board with Pre-Welded Nickel Strips.
All your electronics components and prototyping accessories are available with fast shipping across Egypt from Pro Tronix!
