Affected devices: Galaxy Nexus, Nexus 4, and Nexus 7 

Word is Google Play downloads are responsible for the weak battery life on Nexus devices. Nexus 7 owners normally get up to 3 days of power on their device, but the recent software update has caused many to see their tablets go dead in less than 30 hours. NFC is cited as another culprit draining juice on all Nexus models. Though, that shouldn't come as a much of a surprise.