I'm at 146 hours of uptime now. Never gone this long without a random reboot, even on my nexus 5. It helps that the battery is better as well, so I haven't had it die on me yet. Yesterday had 3.5 hours of screen on time, over an hour of phone calls, 1.5 hours of streaming slacker, all in about 10 hours off charger. My nexus 5 would have been dead by 3pm, but I plugged the S5 in after 6 and still had 20% left.
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