3S 20A Li-ion Lithium Battery 18650 Charger PCB BMS Protection Board For Drill Motor 12.6V Lipo Cell Module 64x20x3.4mm – KSH 400 at HIMASTORES Mombasa – best electronics in Kenya
Home / Batteries and powerbanks / 3S 20A Li-ion Lithium Battery 18650 Charger PCB BMS Protection Board For Drill Motor 12.6V Lipo Cell Module 64x20x3.4mm

3S 20A Li-ion Lithium Battery 18650 Charger PCB BMS Protection Board For Drill Motor 12.6V Lipo Cell Module 64x20x3.4mm

SKU: HMJ611 Category: Batteries and powerbanks
KSH 400.00
In Stock

Product Description

3S 20A Li-ion Lithium Battery 18650 Charger PCB BMS Protection Board

Compact Battery Management System for 3Cell Liion Packs

The 3S 20A BMS Protection Board is a compact battery management system designed to protect 3series lithiumion battery packs for drill motors and portable devices. Featuring 20A continuous discharge current, 12.6V full charge voltage, and short circuit protection, this board provides reliable protection against overcharge, over-discharge, overcurrent, and short circuits in a compact 64x20x3.4mm form factor.

Designed for 3.6V/3.7V Li-ion cells (18650, 26650, polymer)
Supports 3S configuration with 12.6V full charge voltage
This is a nonbalancing version use matched cells

Technical Specifications

ParameterValue
Battery Configuration3S (3 cells in series)
Supported Battery TypesLiion / LiPo (3.6-3.7V cells)
Full Charge Voltage12.6V
Continuous Discharge Current20A
Charge Current10A - 20A
Overcharge Detection4.25V ± 0.05V per cell
Over-discharge Detection2.3V ± 0.05V per cell
Short Circuit ProtectionYes
Quiescent Current< 10uA
Dimensions64mm x 20mm x 3.4mm
MountingThrough-hole pads

= Key Features =

Compact Design - 64x20x3.4mm form factor fits tight spaces

20A Discharge Capacity - Suitable for drill motors and power tools

Comprehensive Protection Overcharge, overdischarge, overcurrent, and short circuit protection

Low Standby Current - Only 10uA quiescent current minimizes battery drain

Drill Motor Compatible Specifically designed for 3series drill motor applications

Direct Replacement Easy dropin replacement for standard BMS boards

= Applications =

  • 12.6V drill motors and power tools
  • 3S Li-ion battery packs (18650/26650)
  • Portable power supplies
  • LED lighting systems
  • Small electric devices
  • DIY battery projects

Wiring Guide

ConnectionDescription
B+Positive terminal of cell 3
B1Positive terminal of cell 1 (balance wire)
B2Positive terminal of cell 2 (balance wire)
B-Negative terminal of cell 1
P+Positive output/charge input
P-Negative output/charge input

> Connect in series: Cell 1: B- to B1, Cell 2: B1 to B2, Cell 3: B2 to B+

Use appropriate wire gauge for 20A current
Connect balance wires in strict order: B- then B1 then B2 then B+

Wiring Sequence

  1. Connect B0 (B-) to battery pack total negative
  2. Connect B1 to connection between cell 1 positive and cell 2 negative
  3. Connect B2 to connection between cell 2 positive and cell 3 negative
  4. Connect B+ to battery pack total positive (cell 3 positive)
Voltage sequence: 0V (B-), 3.7V (B1), 7.4V (B2), 11.1V (B+)
Measure voltage between adjacent points to confirm correct wiring
Incorrect wiring will damage the BMS

How It Works

  1. *Overcharge Protection*: Disconnects charging when any cell exceeds 4.25V
  1. *Over-discharge Protection*: Disconnects load when any cell drops below 2.3V
  1. *Overcurrent Protection*: Disconnects during short circuits or excessive loads
  1. *Short Circuit Protection*: Rapid response protects against shorts
This is a nonbalancing BMS cells must be well-matched for optimal performance
Use cells from the same batch with similar voltage before assembly
Battery pack without balancing will degrade over time if cells are mismatched

Why Choose This BMS?

Compact 64x20mm size fits tight battery compartments
20A continuous current for drill motors and power tools
Over 10uA low standby current for long battery life
Comprehensive protection ensures safe operation
Same port for charging and discharging
Direct replacement for standard BMS modules

√ Compatible with 18650 and 26650 Li-ion cells

√ Easy installation with clear wiring labels

√ Proven reliability for DIY and professional use

√ Suitable for 12.6V drill motor applications

Safety Precautions

Do not use with LiFePO4 batteries Liion/Li-Po only
Do not exceed 20A continuous discharge
Ensure correct wiring order before connection
Use only with appropriate charger (12.6V)
Keep away from moisture and heat
Use matched cells for optimal performance
For applications exceeding 20A, consider a higher-current BMS model
This nonbalancing version requires cells with similar capacity for longterm reliability

The 3S 20A BMS Protection Board provides reliable battery protection in a compact 64x20x3.4mm package. Designed for drill motors and portable devices, it offers comprehensive protection for your 3series Liion battery packs at an affordable price.

BMS 3SBMS 20ABMS BATTERYPROTECTION LITHIUMBATTERY 18650 DRILLMOTOR POWERTOOLS DIY BATTERYPACK 12.6V LIPO New Best Seller 3S BMS