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Charlton cruised into the second round of the Capital One Cup with a 4-0 home win over 10-man Colchester on Tuesday night.
Yoni Buyens put Athletic in front with a penalty on 24 minutes after a handball by United captain Magnus Okuonghae, who was sent off.
Lawrie Wilson scored twice in five minutes early in the second half to put the tie to bed.
He finished a pass from Jordan Cousins for Addicks' second goal on 54 minutes and found the bottom corner after being set up by Franck Moussa on 59 minutes.
Simon Church added a late fourth after good work by Johann Berg Gudmundsson.
Charlton boss Bob Peeters said: "It is the first home game so you want to show something to the fans and I think at times we did well.
"I'm happy with the clean sheet and happy that at this moment we don't have any injured players. I think the fans had a good night."