Earlier this month, a tipster told us that the Google Nexus 5 could have two different batteries powering the phone, depending on which model of the phone you're looking at; according to our source, the 16GB version of the phone will be powered by a 2300mAh cell while the 32GB variant will be powered by a larger 3000mAh battery...
Source: http://www.phonearena.com/news/Images-of-Nexus-5-2300mAh-battery-leak_id48687
Source: http://www.phonearena.com/news/Images-of-Nexus-5-2300mAh-battery-leak_id48687