Whats a good battery pack for Samsung S9?

I was looking on amazon for battery packs for my S9 and samsung tablet. I was just curious whats a good battery pack that goes with the S9? I know some has qualcomm quick charge 3.0? Can i use that and wont damage the battery life on the s9? I know that the s9 is qualcomm quick charge 2.0 but i cant seem to find any on amazon. Also what would happen if i used a 3amp charger?

Thanks!

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