# BMS module 3S, 40A, 12.6V, with balance

> 3S BMS module with balance for Li-Ion 18650 batteries, used to assemble battery packs for tools and DIY projects. Provides charge and discharge protection for 3 cells in series, supports a charging voltage of 12.6VDC, a maximum discharge current of 40A and a maximum charge current of 10A. Charging and discharging occur through the same port. Dimensions: 41 x 55 x 3.4mm.

- Page: https://sigmanortec.ro/en/bms-module-3s-40a-126v-with-balance
- Price: 10.21 RON
- Availability: In stock; 1-2 zile
- Reference: 33586 · EAN: 5948921850463
- Category: Electronic components > Modules for Batteries > BMS Boards
- Specifications: Technology: Lithium Ion; Load voltage: 12.6VDC; sway: Yes; Number of cells: 3S
- Package (shipping data): 0.01 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 02:21 (Europe/Bucharest)

## Description

3S BMS module with balance for 18650 Li-ion batteries, ideal for assembling battery packs for tools and DIY projects, provides charge and discharge protection for 3 cells in series, supports charging at 12.6V through the same port as the discharge, offers up to 40A discharge current with good heat dissipation, charging current up to 10A, compact format 41 x 55 x 3.4mm.
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 charged).
Can be used for creating batteries dedicated to tools.
Both charging and discharging are done through the same port.
Specifications:
Version: With balance
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 assembling elements and connections will lead to module damage.
The sketch represents the assembly of 6 cells (3 in series, then connected in parallel).