# BMS module 4S with balance, 30A, 16.8V

> 4S BMS module with balance function for Li-Ion batteries, reference 9064. Charging voltage 16.8VDC, nominal current 30A (charge and discharge). Includes short circuit protection, internal resistance

- Page: https://sigmanortec.ro/en/bms-module-4s-with-balance-30a-168v
- Price: 19.23 RON
- Availability: In stock; 1-2 zile
- Reference: 9064 · EAN: 5945435480131
- Category: Electronic components > Modules for Batteries > BMS Boards
- Specifications: Technology: Lithium Ion; Load voltage: 16.8VDC; sway: Yes; Number of cells: 4S
- Package (shipping data): 0.019 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 02:22 (Europe/Bucharest)

## Description

4S Li-ion battery protection and management module, ideal for 4x18650 packs and tool batteries. Offers 16.8V charging, up to 30A charging and discharging current, active balancing for cell equalization and increased durability, includes short circuit protection and low internal resistance for minimal losses.
4S lithium battery charging protection module (example 4x18650), BMS (Battery Management System) type for cells with a nominal voltage of 3.7V (4.2V charged).
Can be used to create tool batteries.
This BMS is provided with the cell balancing function, increasing the durability and performance of the battery used. All cells will be loaded at the same level.
Specifications:
Version: with Balance
Battery charging voltage: 16.8V
Maximum discharge current: 30A (with good heat dissipation)
Maximum charging current: 30A (check the battery specifications)
Battery balance current: 60mA
Short circuit protection: Yes
Internal resistance: <15mOhm
Dimensions mm: 56 x 45 x 3.4mm
When using brush motors, we recommend connecting a non-polar capacitor (10uF-100uF) in parallel with the motor terminals to prevent reverse spike voltage.
Do not mix defective batteries with functional ones.
The closer the resistance of the 4 batteries is, the better.
Non-observance of the diagram when mounting elements and connections lead to module failure. * informational image