Assuming the battery was at 9V, it will take a trickle charger 24 hours to get to 12.5V. There is always some voltage drop, radio, etc that will use milliamps, but nothing to drain rapidly. Your glove box is closed?

Turn off your day time running lights. On the light switch, push in the little screw and turn it to 11:00 o'clock. At least when you turn the key to posII the headlights and tail lights won't come on.

Getting 1-1-1 on an OBD port means there are no faults. That is a good thing. Unfortunately, if it is a bad CPS you will probably not get a code for that as the engine must be running to post a code. You will also not get a spark if the CPS is bad.

Time to pull a spark plug and check the tips for wetness, making sure the fuel injectors are delivering fuel. And then crank the engine to check for spark. I would leave the spark plug cover off until you get the engine running again.