Hi Folks, I picked up a little Estes Proto X and I'm having a grand time with it. Thing is, the battery only lasts about 5 minutes (which is why I also bought an eachene 010) and there's no way to change out the battery. Peaking in through the plastic cover, I see that it looks as if it has a standard plug though. Then I noticed the Estes ProtoX SLT -- which looks pretty much the same but has a battery you can swap out. I also saw some plastic replacement parts for the SLT, which look like they might fit on the X version. So has anyone bought the Proto-X SLT? The ProtoX seems pretty common, but I couldn't find the SLT version even on Banggood (although their search engine is... lacking). Any thoughts on if the SLT was some sort of weird version that Estes never made more of and it's just been sitting on Amazon? Thanks!