The Addicks have climbed up to ninth in the table, and are still in with a slim chance of making the play-offs with two games left, after a run of six matches without defeat.
They have also won their last three at The Valley, having previously won just four times in front of their own fans all season, yet Powell says there has been no radical change to their approach to home games.
"There's been no changes whatsoever," he said. "That's why I was saying when we were losing games it was very close. It was marginal.
"This league is marginal, trust me. Everyone can see it's a point here, it's a goal that goes in for you late on or early on there, that's how this league is.
"You see it week in, week out. We've been on the front foot a little bit more of late, but I felt the international break really helped us.
"It was a really tough time before then, but I think it gave us a bit of breathing time and thinking time. And the players have really responded.
"My staff and myself have looked at what we could do and the players have really pushed themselves at a time in the season where a lot of teams' energy levels drop.
"I won't allow that and they've been really worked hard and they are looking fit and strong. I suppose we wish there were 10 games to go, not two."
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