Building a Low Cost Power Tank for 4G Router

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Required items 

  •  18650 3.7V – 4300mAh (2000mAh Actual) Li-ion Battery X 6 (You can use 3 as well)

    Some links in Sri Lanka to Buy

    https://nilambaraelectronics.com/product/3-7v-2200mah-li-ion-18650-battery/

    https://www.daraz.lk/products/lithium-ion-icr18650-1500mah-icr-18650-37v-36v-li-ion-rechargeable-battery-for-portable-fans-and-solar-motion-sensor-lights-i120539339-s1035478092.html

  • 3S 20A 12.6V Li-ion Lithium Battery 18650 Charger Protection Board PCB BMS Cell Charging Protecting Module 

    https://nilambaraelectronics.com/product/3s-20a-12-6v-li-ion-lithium-battery-18650-charger-protection-board-pcb-bms-cell-charging-protecting-module/
    https://www.daraz.lk/products/3s-20a-126v-li-ion-lithium-battery-18650-charger-protection-board-pcb-bms-cell-charging-protecting-module-i125327759-s1042307495.html


  • 1N4007 Rectifier Diode X4(nos) 

    https://www.daraz.lk/products/10pcs-rectifier-diode-assorted-1n4007-diy-kit-i122859337-s1040431779.html

  • 1000uf/25v  Radial Electrolytic Capacitor

    https://nilambaraelectronics.com/product/1000uf-electrolytic-capacitor/
  • 100uf/25v  Radial Electrolytic Capacitor

    https://nilambaraelectronics.com/product/100uf-electrolytic-capacitor/
  • 7812 12V Voltage Regulator 

    https://nilambaraelectronics.com/product/7812-12v-voltage-regulator/
  • DC Jack Female Wire Terminal Connector (Barrel Jack Female)
    https://nilambaraelectronics.com/product/dc-jack-female-wire-terminal-connector-barrel-jack-female/

Connecting BMS module with  Lithium Batteries

Connection Digram with BMS
 




























How to solder batteries : 
Option 1  : Using spot welder   


Option 2 : Soldering batteries by Soldering iron


Now your BMS Module is ready with batteries 





Connection for Power adapter and Barrel jack 


Adding power regulator and conditioner to the DC Load side





Overall Diagram





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