12v Router UPS design - 3S batteries Prt 1

Here is a design for a UPS style power supply. It uses 6 x 18650, 3000 mAH Li-ion cells to provide 12V back-up power for a Router.
The design uses a 24V 4 A power supply, a Buck convertor to step it down to 12.6V and a Li-ion 3S battery charging circuit.
When the power drops the Li-ion cells take over supply and should provide several hrs running the Router. Thus giving the household time to back-up in the cloud and keep running.
100W Power Supply Module AC 220V to DC 24V 4A 6A AC-DC
XL4015 E1 5A DC-DC (buck convertor)
3S 20A Li-ion Lithium Battery 18650 Charger PCB BMS Protection Board 12.6V Cell
6x 18650 Li-ion cells
[Sourced from eBay and Amazon or Banggood]
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