Decision trees are best suitedfor:
one decision inone period.
one decision overseveral periods.
several decisionsover one period.
several decisionsover several periods.
none ofthese.

Decision Trees are best suited for several decisions over one period.

Explanation:

Decision tree gives an effective method for making decisions. It is a tree-like model used for decisions and analyses consequences, including resources cost, outcome and utility. It also helps us to make best and good quality decisions on the basis of given information. It is also widely used in machine learning and commonly used  in data mining as a tool.

so much for the extra points :

it most likely is charging, however when using a hot spot, it drains straight through battery life.