Different between size #13 & #675 battery?

I actually use Powerone and Duracell. those batteries works well with my hearing aid :)

Power One is what I used with Rayovac every now and again :) Never used Duracell altho I have seen it in the shops.
 
I get mine (675) regularly from CVS. They often have buy-one-package-get-one-package-free. I used to be a big fan of getting them online, but I started to notice they didn't last long. The CVS ones really seem to last long, so I'm a fan of that right now :)
 
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