The best way to sum up Meridian is as a more powerful and reasonably priced but less physically polished alternative to Mophie’s $100 Juice Pack Air. At a distance, you might have trouble telling the two black, soft touch rubber-coated hard plastic shells apart, and there’s no question that they have plenty in common. However, Mophie’s design is modestly smaller, benefits from more curved edges, and has built-in button protectors…