Dead battery, cigarette charger, and horn chirp

[Xcellr8]

Following up on an earlier thread (Re: emergency trunk release)
The car is stored at a storage center. Previously I was not able to move the car, but today was able to tow it near an electrical outlet and plugged a charger into the cigarette lighter.

The charger appears to be giving the car at least some charge because the horn (I'm thinking alarm) is chirpping every 30 seconds or so. So I'm tryimg to figure out how to get the horn from going off.

Tried putting the key in, no diff. Tried taking the key out and locking the door, no diff.

So far, I pulled the following fuses, B3 - two tone horns, B8 - Central locking/alarm system control unit, C3 - also Central locking/alarm system, and E1 - another central locking/alram system control unit.

The horn is still chirpping. Whatelse can I do?

Thanks, Joe