Should I let battery die or charge from <5%?

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http://forums.androidcentral.com – Yeah so like the topic says which is better for maintaining the battery and having a longer battery life? Also when charging should you do it when the phone is booted up or once it is dead and then you put the charger in so the phone charges on that black screen where all that appears is the battery cell? Thanks Sent from my Nexus 4 using Tapatalk 2 (HowTos)