Fully charged battery drains as soon as phone turned on.

I'm having a problem I haven't had before and didn't see anything exactly like it when I searched the forums. When I put a fully charged battery in my phone, it starts draining immediately as soon as the phone boots back up. I can literally watch the battery indicator go down to the yellow mark in a matter of seconds. I have four batteries and so far I've tried the two that were fully charged. I have to charge the other two to see if they do the same thing. Earlier today I got some kind of message telling me to update my firmware when I checked it so I did, even thought I didn't think there hadn't been a new one for a couple of months at least. Other than that, I installed a couple of new apps and updated a few that I already had. I just uninstalled the new apps so I guess I'll see if that had anything to do with it once the other batteries charge and I can try them out. Has this ever happened to anyone else?

I'm thinking it was an app because it hasn't happened since I uninstalled the two apps that I had installed prior to the problem. As far as I know, they were "legitimate" apps though: Best Buy and Amazon. But yea it was crazy watching the battery indicator go down like that in just a few seconds lol!