Two questions: 1. why not just carry a battery case for your Nexus 4? 2. keep in mind that modular = bigger. Would you still like to carry the phone if it meant

Two questions: 1. why not just carry a battery case for your Nexus 4? 2. keep in mind that modular = bigger. Would you still like to carry the phone if it meant that in Nexus 4 configuration it would be 2 times bigger and weight two times as much as your regular Nexus 4?