Recently I was reading this answer to the question Why does boron add to the less substituted carbon in the hydroboration of an alkene?. See the transition state given in the above answer, and the reason given to explain it's stability.
As far as I know, hyperconjugation is a result of σ-p interaction in carbocations. If partial charges are developed(as in the case of linked answer), there is no empty p orbital in them.
So how can hyperconjugation be used to explain their stability?