There's plenty of pop left in this energy drink growth story.Investors in Celsius Holdings (CELH -2.37%) could use one of the company's heath-focused energy drinks for a pick-up right now. Shares of this once high-flying beverage industry innovator are down about 52% from their 52-week high.Concerns that the company may be past its peak growth stage have resulted in a swift change in market sentiment. Still, there's good reason for investors to stay confident as Celsius still boasts plenty of positives, inc ...