Moduł BMS ładowarka ogniw Li-ion 1S 18650 21700 2A 3,7V 4,2V zabezpieczenie

BMS Li-ion cell charger module 1S 18650 2A 3.7V 4.2V

A compact protective BMS module designed to control the charging and discharging of a single Li-ion cell (1S). The circuit effectively protects batteries from over-discharge, overcharge, and short circuits, significantly extending their service life and ensuring safe operation. The module supports popular 18650 and 21700 cells.

For correct operation, using a converter with current limiting (CC) or a power supply with adequate current capability is recommended, because the BMS limits voltage but does not control charging current. Power is connected to the same terminals as the load (P+, P-).

Example applications

• Regenerating power packs in power tools by replacing old Ni-Cd cells with modern Li-ion cells.
• Building custom power banks and portable power sources.
• Protecting power supplies in electronic projects and embedded systems.
• Powering high-power LED flashlights and outdoor gear.
• Creating power packs for toys and radio-controlled (RC) models.

Key technical specifications

• Nominal voltage: 3.6 - 4.2V
• Charging voltage: 5 - 10V
• Number of cells in series: 1 (1S)
• Compatible cells: 18650, 21700
• Charge cutoff voltage: 4.15 - 4.25V
• Discharge cutoff voltage: 2.40 - 2.60V
• Peak discharge current: 2.5A
• Continuous discharge current: 1.5A
• Continuous charge current: 1.5A
• Maximum power: 10W
• Operating temperature range: -40 to +50°C
• Dimensions: 13 x 13 x 2 mm

Benefits

• Comprehensive protection: Overcharge, deep discharge, and short-circuit protection.
• Extended cell life: Keeping electrical parameters within safe ranges prevents irreversible battery damage.
• Compact size: A 13 x 13 mm footprint allows easy integration even in very tight spaces.
• Scalability: Multiple packs with BMS modules can be connected in parallel to increase current capability.
• Simple installation: The charger and load connect to the same terminals (P+, P-), simplifying the wiring.

Note: Some module samples may require briefly connecting a charger for initial activation of the BMS. When connecting cells, do not mix new cells with worn ones, and connected batteries should have the same capacity.