Yes, it takes electricity to set it off... you disconnected everything so it's dead now.
I took my kiddo all over the place in both my 92 B&T and in the '03. Never had a second thought about it. He LOVED looking up and all around at things when the top was down. Just watch out for young eyes when the sun is high in the sky.
RJ
Daily Driver: 2013 Club edition in Pearl White Mica
Lightness? What's that? I drive a PRHT!