DeWalt Tools, Replacement Battery question?

I have tried 2 different after mkt Dewalts, both didn't have enuff oomph, and didn't take a charge for very long, lasted maybe 6 mos at less and less capacity .
If I had to stick with Dewalt, I'd go original with warranty .
I can prob give pix of the duds if you like .
Gone Milwaukee, twice the quality imho .