No, you don't want to use that sentence. The following is much better. I've been there once before.
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PreciousJonesI've been there once before when I was here a year ago.You will rarely see an inappropriate mix of tenses like that in writing, but you may hear people say things like it. When we are speaking, ideas sometimes run together.
Shorter is usually better.
I was there once, about a year ago.