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Hi everyone,

​​​​​​I was hoping I could get some help troubleshooting an issue with my 2018 civic EX-T sedan. I recently got a remote work position and now that I'm not driving every day, I've noticed my battery dies in about 3 days (without any driving).

Initially I thought I left a light on, and so when I tried charging the battery it says bad battery. I went and got a new battery, started right up but no lights were on. I also saw the alternator was charging the battery but when I turned the car off it was draining pretty quickly. Within 3 days it was very low, so I turned the car on for half an hour and it charged the battery.

I have a multimeter, but no idea where to start. Any ideas on what I can check, and in what order? Or is there any additional info I can provide? I have LoJack, but I think that's the only modification on the car. Also I had a tail light out before I stopped driving daily, but I moved the wires around behind the tail light box a little and they started working, so I left it alone and put the tail light assembly back. It still works normal, but maybe this broken wire needs to be replaced? I've also read about checking fuses and relays, but I haven't done that yet.

Any help would be greatly appreciated, thank you!
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Update: I saw a video on YouTube explaining how to diagnose parasitic draw, and so I disconnected the ground and measured from the post to the ground and got .6 amps. So the video said to clamp the multimeter to the post and cable to get a constant reading, and pull fuses until it falls below 50 milliamp. I am going to try this in a little bit to narrow down the component(s) that is(are) causing the drain.

 
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Update 2: what should I do next? I pulled a 10amp fuse that looks like it's a backup light or camera, probably the light, and my multimeter went dropped significantly, .7a to .054a... See top right hole, there was a 10a fuse there. And then corresponding diagram below.

 
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Here is everything on fuse A18.