Slim green 1S 3.7V 3A 2MOS battery protection board with black components and metal tabs

1S 3.7V 3A 2MOS BMS Li-ion 18650 Battery Protection Board

SKU NA645

$3.99 USD Shipping & tax calculated at checkout
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1S 3.7V 3A 2MOS BMS battery protection board for Li-ion, LiPo, and 18650 cells, managing charge/discharge safety for DIY power banks, robotics, IoT nodes, wearables, and prototyping.

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Overview

Product Overview

A 1S protection board for a single 3.7 V Li-ion, LiPo or 18650 cell. A DW01A controller with dual 8205A MOSFETs cuts off at 4.25–4.35 V over-charge, 2.3–2.5 V over-discharge and about 3 A over-current, and recovers automatically after a short circuit. It passes 3 A continuously with under 50 mΩ internal resistance and draws under 6 µA at rest, so a protected pack can sit for months.

At about 33 × 7 × 3 mm it fits alongside an 18650 or inside a pouch-cell wrap. Wire B+/B− to the cell and P+/P− to your charger and load. For power banks, ESP32 and Pico sensor nodes, LED projects and small robots. Single or 5-pack.

Questions & answers

Frequently asked questions

This protection board is intended for one 3.7V single-cell Li-ion battery, including an 18650 or equivalent 1S Li-ion/LiPo cell. It can support Arduino, ESP32, or Raspberry Pi-based builds when used as part of a suitable portable power design.
No programming or firmware setup is required. The board is a hardware battery protection module, so installation mainly involves wiring it correctly into a single-cell battery pack and the device’s power path.
This is a 1S protection board for a nominal 3.7V lithium cell and is rated for 3A operation. It is for single-cell packs only, not 2S or higher-voltage battery packs.
It is suitable for compact rechargeable projects such as small robots, IoT nodes, LED projects, USB-powered gadgets, custom power banks, and embedded prototypes. It helps add cell protection to DIY portable electronics using one lithium cell.
This board helps protect a lithium cell during charge and discharge, but it is not a complete charger or power supply by itself. Use it with a compatible 1S lithium charging circuit and a load within the board’s rating.

Have other questions?

Chat with our US-based team — we usually reply fast.

What's included

Features & Specs

1S protection for 3.7 V cells Li-ion, LiPo and 18650; full charge 4.2 V.

DW01A + dual 8205A MOSFETs Over-charge 4.25–4.35 V, over-discharge 2.3–2.5 V, over-current about 3 A, short-circuit with auto-recovery.

3 A continuous Enough for ESP32 nodes, LED strips and small motors.

Under 6 µA quiescent Negligible drain on a parked pack.

Under 50 mΩ internal resistance Minimal voltage drop under load.

~33 × 7 × 3 mm Slips alongside an 18650 or inside a pouch-cell wrap; −40 to +85 °C.

Single or 5-pack B+/B− to the cell, P+/P− to charger and load.

Reference

Documents

Full Product Manual 1S 3.7V 3A 2MOS BMS Li-ion 18650 Battery Protection Board | ShillehTek Product Manual In-depth setup guide with wiring, code examples, and troubleshooting.

Datasheet - 1S BMS Protection Board

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