The winger has been a major positive in a difficult start to the season for the Addicks, and he scored one and made another in Saturday's 2-2 draw at fellow strugglers Yeovil.
"He is a good player," said Powell.
"He has made a bit of a difference to us because he is a real positive player - he beats players, he gets crosses in and he has scored a number of very good goals for us so far.
"I want that to continue. He is enjoying his football with us, he is a real likeable character.
"From what was happening with him at Hull, to come here on loan and get games and contribute like he has done I'm really pleased with him."