"mophie makes adding extra battery to your Moto Z phone a snap. The Juice Pack battery made for the Moto Z family of smartphones uses Built-in magnets to attach to the back of the phone. The slim design fits comfortably in your hand while Providing more than 60% extra battery. Charging starts automatically once the Juice Pack is attached so you’ll never see a “low battery” warning until the Juice Pack is empty. To recharge the Juice Pack, simply charge your Moto Z and power will be sent to both devices. mophie uses advanced battery technology to create safe, reliable products and deliver the most efficient charge with the highest battery density possible. Charge Vault technology enables our industry-leading Juice Pack batteries to hold their charge for an extended period of time so they are ready right when you need it. Stay powerful."