maybe the battery was a telling the truth and not using the conventional thinking of electrical flow????
Mad that, it might have been in the right way but when you opened it it fliped as the case opened.
I had 2 car keys for my remote locking/alarm the battery went in one so I opened it up (following the insturctions of course) and the inside of the key, the PCB shattered, when I used the second key till it dided, tried to change the battery and it did the same! Mad!
"No pressure, no diamonds" Thomas Carlyle