4S 10A BMS Battery Management System – Used/Tested 14.8V 18650 Lithium-ion Protection Board in Pakistan

Overview

The 4S 10A BMS (Pre-owned) is a salvaged but fully functional protection board designed for 3.7V Lithium-ion or Lithium Polymer cells. When wired in a 4-series (4S) configuration, it manages a battery pack with a nominal voltage of 14.8V and a full charge of 16.8V. Even though this unit is used, it has been bench-tested to ensure the MOSFETs and protection ICs are working correctly to safeguard your cells against common electrical hazard

Condition Note 

• Grade: A/B (May show signs of previous soldering or minor cosmetic scratches).

• Testing: Every unit is tested for continuity and voltage output before shipping.

• Value: Ideal for non-critical applications, school projects, or testing prototypes where a brand-new BMS isn’t necessary.

Key Features 

• 4-Cell Management: Specifically tuned for four 18650 or 26650 Li-ion cells.

• Triple Protection: Safeguards against over-charging ($>4.25V$), over-discharging ($<2.5V$), and short circuits.

• Compact Footprint: Small enough to fit inside standard DIY battery enclosures or 3D-printed cases.

• 10A Continuous Output: Sufficient for LED strips, small DC motors, and low-power DIY electronics.

Technical Specifications

Feature	Specification
Condition	Used / Pre-owned (Tested)
Configuration	4S (4 Cells in Series)
Nominal Voltage	14.8V
Full Charge Voltage	16.8V
Continuous Current	10A
Instantaneous Current	12A – 15A
Charging Voltage	16.8V – 17.0V
Size	Approx. 35mm x 35mm (Varies slightly by batch)