Either you're all too good at this game, or I'm not very good at it! Yesterday's pic was, as many people guessed, the end of a battery. Can you tell what today's picture is?
Having read the answer already, I can't really guess! However, had I not known the answer I probably would not have gotten it right. This one was tricky!
. . . . . It's a mystery object! (and I claim the prize!)