Phones will (and should) always optimize for being as thin and small as possible. Battery cases and packs can make the battery of a thin/light phone meet the ne

Phones will (and should) always optimize for being as thin and small as possible. Battery cases and packs can make the battery of a thin/light phone meet the needs of heavy users, but there is no accessory that can make a thick/heavy phone thinner and lighter. The lack of success for the Moto Maxx is a testament to the idea that there isn't really a substantial power user segment that doesn't care about thin/light,