What is the difference between a cheap battery and an expensive one?
Being woken up in the middle of the night on a Sunday when the fire alarm starts chirping its "low battery" chirp.
It's so loud it would definitely kill any shred of power the battery still had in it.
I got up to make sure there's no fire around, but I was so tired that everything seemed smoky and hazy. I went around the house looking for that elusive fire with the tune of "the roof is on fire" playing in my head and noticed that Wabby the dog is standing up inside his night time bed/cage; he has a problem with loud sounds, and while he will gladly and ferociously attack a rottweiler he tucks his tail down and goes very scared at the mere sight of a balloon, afraid it would explode loudly.
A very surrealistic experience, those fire alarms.