# BMS module 4S, 40A, 16.8V

> BMS module 4S, 40A, 16.8V, enhanced version (no balance), for lithium-ion packs with cells of nominal voltage 3.7V (4.2V charged), e.g. 18650. Manages charging at 16.8VDC, supports maximum discharge current of 40A and maximum charge current of 20A. Dimensions: 45 x 55 x 3.4 mm. Suitable for tool batteries.

- Page: https://sigmanortec.ro/en/bms-module-4s-40a-168v
- Price: 14.24 RON
- Availability: In stock; 1-2 zile
- Reference: 33612 · EAN: 5943749316122
- Category: Electronic components > Modules for Batteries > BMS Boards
- Specifications: Technology: Lithium Ion; Load voltage: 16.8VDC; sway: Not; Number of cells: 4S
- 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 00:21 (Europe/Bucharest)

## Description

BMS protection for 4S lithium packs, ideal for 18650 cell batteries and tool applications. Manages charging up to 16.8V and protects against discharge, supporting up to 40A when discharging and 20A when charging, enhanced version without balance, compact format 45 x 55 x 3.4 mm for easy integration.
BMS board for lithium batteries, "enhanced" version.
The module provides protection for charging lithium batteries (e.g., 18650), a BMS (Battery Management System) type for cells with a nominal voltage of 3.7V (4.2V charged).
It can be used for creating dedicated batteries for tools.
Specifications:
Version: Enhanced (without balancing)
Battery charging voltage: 16.8
Maximum discharge current: 40A (with good heat dissipation)
Maximum charging current: 20A (check battery specifications)
Dimensions mm: 45 x 55 x 3.4mm