2007 Civic Hybrid completely dead except of 4-way flasher and horn, Batter good.

Well, here's what's happened so far. I'm not sure what ran the battery down but that's what seemed to cause the problem. It seems that attempts to jump start it blew the 100 amp "Main Fuse" in the under-the-hood fuse compartment. Once that was fixed everything worked except the door locks (tried both sets of keys). After much experimenting, I changed the batteries in both keys, even though they tested as good, and that fixed that. So now everything works but I'm trying to figure out what runs the battery down. I've charged the battery and now it seems to hold a charge. I've also put the voltmeter on DC amps (thanks to the excellent Royalty Auto troubleshooting videos on YouTube) and checked the draw but only see 15 milliamps. They say not to worry unless you see 30 - 50 milliamps or more. I'm still testing but in summary the initial problem seems to have been that 100 amp main fuse in the under-the-hood engine compartment. Hope this helps someone else with the same problem!