# BMS module 3S, 40A, 12.6V

> BMS module for 3S Li-Ion packs, Enhanced version, with charging voltage 12.6VDC. Supports a nominal discharge current of 40A and a maximum charge current of 10A. No balancing function. Dimensions: 41 x 55 x 3.4mm. Manages charge and discharge protection, suitable for assembling 12.6V batteries from 18650 cells, used in tool applications.

- Page: https://sigmanortec.ro/en/bms-module-3s-40a-126v
- Price: 9.30 RON
- Availability: In stock; 1-2 zile
- Reference: 33611 · EAN: 5942330508984
- Category: Electronic components > Modules for Batteries > BMS Boards
- Specifications: Technology: Lithium Ion; Load voltage: 12.6VDC; sway: Not; Number of cells: 3S
- Package (shipping data): 0.009 kg
- Updated: 2026-09-23
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 03:25 (Europe/Bucharest)

## Description

BMS module for 3S Li-Ion packs, ideal for assembling 12.6V batteries from 18650 cells and tool applications, manages charge and discharge protection for stable operation. Enhanced version, supports up to 40A discharge with adequate cooling, up to 10A charge, compact format 41 x 55 x 3.4 mm for easy integration.
Protection module for charging lithium batteries (example 18650), type BMS (Battery Management System) for cells with a nominal voltage of 3.7V (4.2V when fully charged).
Can be used for creating batteries dedicated to tools.
Specifications:
Version: Enhanced
Battery charging voltage: 12.6V
Maximum discharge current: 40A (with good heat dissipation)
Maximum charging current: 10A (check battery specifications)
Dimensions mm: 41 x 55 x 3.4mm
Failure to follow the diagram when mounting the components and connections will lead to module damage.
The diagram shows the assembly of 6 cells (3 in series, then connected in parallel).