What items still use a 9 volt battery

There has got to be a whole host of electronic devices that still use them or the batteries would not still be for sale. Stores don't display inventory that doesn't move because that could make the business not-profitable. :-(
 

D sized batteries used to be made with Zinc so you could put some pool acid in a soda bottle, add the battery case and generate hydrogen gas. Just put a balloon over the top and you have a balloon that would rise.

2HCl + 2Zn --> H2 + 2ZnCl

Fun and a bit on the explosive side!
 

Smoke detectors and my mutimeter and had an active pickup bass guitar and an another electric guitar with a db boost function on it.
 
I noticed the same thing, few 9V on display in stores. Even the dollar stores used to sell a twin pack. To get a deal you have to buy an 8-10 pack to get under a dollar a battery if one is so lucky.
 
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