What's the most powerful cordless handheld vacuum? I'm trying to get a handheld vacuum and be wonder if anyone...

I'm trying to get a handheld vacuum and be wonder if anyone know of a good one? The end one I had be such a disappointment since the power were so undersized. Now I want one that is powerful and i guess would be devout if it's save animation -.-' since everything now is just about "saving energy" anyway. Thanks within advance !