Lipo batteries expand if it has room. Not an issue if the enclosure is strong enough to withstand the expanding battery. The Silo case is strong enough that it won't be an issue. This also will not damage the lipo.
In other words, don't worry about it.
If it does expand it will push against the board, jamming the buttons possibly?
I have never had a lipo battery expand on me so far, So I'm not expecting any problems.
Just had to point it out