Okay, so I got 2 MP Grimlocks. One so far I am keeping sealed, and one I am opening. I might give the second to my son, as a gift, but I don't know for sure yet, as I am still gauging his interest in TF toys. In the event I keep it sealed, won't the toy leak battery acid in time, since it does use batteries? It has one of those tabs dividing the battery, so does that keep it from leaking? How do people keep these sealed for years and years, and keep them from leaking? Thanks for any info.