3S21P 18650 Battery Backup

I am cleaning out my fridge :) and have had these 18650s in there for a while so I am using them to create a 12 volt power supply.

This is a battery I will be using for a cellular signal amplifier and also used to charge my cell phone, laptop, and Lipos while out in the field - middle of nowhere. It is built from leftover 18650s from a 3.0 kWh build I did a few years ago so these have just been sitting in my fridge. Each averages ~1800 mAh so I should be able to produce 420 Wh from a full charge. I plan on charging with a 100 watt solar panel while out in the field.

Long story short:
The positive from the protection board goes to the fuse then through the switch then to the positive ends of 12v socket, quick charge socket, the voltmeter, and the xt60 - all soldered together and head shrink wrapped.

The negative side goes from the projection board to the negative ends of 12v socket, quick charge socket, the voltmeter, and the xt60. So the same with the positive but the fuse and switch aren't involved.

The material links can be found on the Thingiverse/YouTube links below.

The STLs for the project https://www.thingiverse.com/thing:6003895