3S 20A 18650 Lithium Battery Charger Protection Board BMS (11.1V - 12.6V) for Li-ion & LiPo Battery Packs

Ensure reliable performance and safety for your 3-cell battery packs with the 3S 20A 18650 Lithium Battery Protection Board (BMS). Specifically engineered for 3-series ( $11.1 ext{V}$ nominal / $12.6 ext{V}$ peak) Li-ion and LiPo cell configurations, this compact module provides up to $20 ext{A}$ continuous discharge current and up to $40 ext{A}$ peak surge protection. Featuring multi-stage protection against overcharge, over-discharge, short-circuits, and overcurrent, it is the ideal choice for powering $12 ext{V}$ LED strips, robotics, small power tools, DIY power banks, and portable electronics.

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Tags 3S 20A BMS 3S 18650 Battery Protection Board 11.1V 12V 12.6V BMS Module 3 Cell Li-ion Protection Board 3S Lithium Battery Charger Board 12V LiPo BMS Protection Module 18650 Battery Management System

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Product Details :

The 3S 20A 18650 Lithium Battery Protection Board is an essential Battery Management System (BMS) designed to protect, maintain, and extend the operating life of $3 ext{-cell}$ ( $3 ext{S}$ ) series-connected Lithium-ion or Lithium-Polymer battery packs. Operating across the nominal voltage range of $11.1 ext{V} - 11.5 ext{V}$ ( $3.7 ext{V}$ per cell) up to a full charge voltage of $12.6 ext{V}$ ( $4.2 ext{V}$ per cell), this module acts as a critical safety barrier against catastrophic battery failures.

Built with high-efficiency power MOSFETs and a precision voltage monitoring controller IC, the board continuously tracks individual cell voltages. If any cell exceeds safe charging parameters or drops below deep discharge limits, the BMS instantly isolates the pack from the charger or load. With a sustained continuous discharge rating of up to $20 ext{A}$ and built-in short-circuit protection, it is an efficient, low-profile solution for custom $12 ext{V}$ battery packs.

Key Features and Benefits

$20 ext{A}$ Continuous Discharge Capability: Low internal resistance MOSFETs handle continuous current draws up to $20 ext{A}$ ( $40 ext{A}$ peak surge rating).
Comprehensive 4-Fold Safety Protection: Full hardware protection against overcharge, over-discharge, overcurrent, and output short circuits.
Low Power Consumption: Ultra-low quiescent operating current ( $le 6mu ext{A}$ ) prevents battery drain during prolonged standby storage.
Compact Strip-Style Design: Narrow form factor easily fits alongside cylindrical 18650/26650 cell packs or inside tight custom battery enclosures.
Wide Compatibility: Works seamlessly with standard $3.7 ext{V}$ Li-ion cells (18650, 21700, 26650) as well as $3.7 ext{V}$ Lithium-Polymer pouch cells.

Technical Specifications

Feature Component	Specification Details
Series Cell Configuration	$3 ext{S}$ ( $3 ext{ Series}$ Li-ion / LiPo cells)
Nominal Voltage Rating	$11.1 ext{V} - 11.5 ext{V DC}$
Full Charge Cutoff Voltage	$12.6 ext{V DC}$ ( $4.2 ext{V} pm 0.05 ext{V}$ per cell)
Continuous Discharge Current	Up to $20 ext{A}$ (with adequate heat dissipation)
Peak Surge Current	Up to $40 ext{A}$
Continuous Charge Current	Up to $10 ext{A}$
Overcharge Protection Voltage	$4.25 ext{V} pm 0.05 ext{V}$ per cell
Over-discharge Protection Voltage	$2.50 ext{V} pm 0.08 ext{V}$ per cell
Internal Resistance	$< 15 ext{ m}Omega$
Operating Temperature	$-40^circ ext{C to } +50^circ ext{C}$

Wiring & Connection Guide

1. Solder Pad Mapping:

Pad Label	Connection Point	Wire Gauge Recommendation
0V ( $B_-$ )	Negative terminal of Cell 1 (Pack Main Negative)	Thick Silicone Wire ( $14 - 16 ext{ AWG}$ )
4.2V ( $B_1$ )	Positive terminal of Cell 1 / Negative of Cell 2	Standard Wire ( $20 - 22 ext{ AWG}$ )
8.4V ( $B_2$ )	Positive terminal of Cell 2 / Negative of Cell 3	Standard Wire ( $20 - 22 ext{ AWG}$ )
12.6V ( $B_+$ )	Positive terminal of Cell 3 (Pack Main Positive)	Thick Silicone Wire ( $14 - 16 ext{ AWG}$ )
$P_+$	Main Positive output to load / Positive input from charger	Thick Silicone Wire ( $14 - 16 ext{ AWG}$ )
$P_-$	Main Negative output to load / Negative input from charger	Thick Silicone Wire ( $14 - 16 ext{ AWG}$ )

2. Wiring Diagram Schematic:

          [Cell 3]             [Cell 2]             [Cell 1]
     (+) ---|||--- (-)    (+) ---|||--- (-)    (+) ---|||--- (-)
      |            |       |            |       |            |
      |            +---+---+            +---+---+            |
      |                |                    |                |
      v                v                    v                v
   +------+----------+------+-------------+------+----------+------+
   | 12.6V(B+)      8.4V(B2)             4.2V(B1)         0V(B-)   |
   |                                                               |
   |               3S 20A BMS PROTECTION BOARD MODULE              |
   |                                                               |
   |     P+                                                   P-   |
   +--------+--------------------------------------------+---------+
            |                                            |
            v                                            v
     [ Load / Charger (+) ]                       [ Load / Charger (-) ]

WIRING ADVISORY: Ensure wires are connected strictly in sequence: $0 ext{V} (B_-) ightarrow 4.2 ext{V} (B_1) ightarrow 8.4 ext{V} (B_2) ightarrow 12.6 ext{V} (B_+)$ . Incorrect sequence or bridging pads with solder during wiring can cause immediate damage to the monitoring IC.

Applications

$12 ext{V}$ DIY Battery Packs: Converting 3-series 18650 cells into replacement batteries for $12 ext{V}$ SLA/lead-acid applications.
Portable Audio & Bluetooth Speakers: Powering high-efficiency Class-D audio amplifiers ( $12 ext{V}$ powered).
Robotics & Smart Vehicles: Powering $12 ext{V}$ DC gear motors, microcontrollers, and sensor arrays in mobile robotics.
LED Strip Lighting & Field Gear: Emergency $12 ext{V}$ backup lighting, portable inspection lamps, and outdoor camping gear.