Uwell Crown good for the VTC Mini?

Hello! I'm quite new to vaping, I got the VTC Mini a few weeks ago and I had a simple Ego stick before. Someone told me that the Uwell Crown is the best tank for the VTC Mini but I'm worried about 2 things.

1. Is 75 watts enough for this tank? Can I get great vapour already at 50 watts for instance?

2. The VTC Mini has only 1 battery, will the Uwell Crown completely kill my batteries as it needs a lot of energy?