I was assuming that the question about the 5000mah battery was not serious...but in case it was...here are a couple pics of that battery (from one of my multirotors)...lined up with some mods...
From left to right:
Seigeli 150w; Ham 1591; battery; ipv4; and Hammond 1590b; Hammond 1590g.
So to answer the question: since the beta box is smaller than all of these - no way.
Think they are using an 850-900 mah batt.