ALL.-KNOWING. BOARD. A smoke detector installed by ADT a few years ago started chirping and obviously needs new batteries. It came with three Duracell Procell AAA batteries, and the smoke detector states "PC2400 DURACELL PROCELL OR ENERGIZER E92 BATTERY ONLY". I searched online and see that these are industrial or "professional" batteries and are not sold in standard consumer blister packs. Not knowing this originally, I looked for them at CVS and then Lowe's and came up empty (I needed standard batteries anyway and got them at CVS, so not a wasted trip). I realize that a smoke detector is not something to take for granted, but is it absolutely necessary to use the industrial/professional batteries instead of standard consumer batteries (e.g., Duracell Coppertop)? I can order the Duracell Procell batteries from Amazon. A Batteries Plus Bulbs store probably has them and the Energizer E92, but I haven't checked there yet. Thoughts?