Not true though is it. Let's use the Nexus line as a case in point. Galaxy Nexus, great phone, terrible battery life. Nexus 4, another solid phone, bigger scree

Not true though is it. Let's use the Nexus line as a case in point. Galaxy Nexus, great phone, terrible battery life. Nexus 4, another solid phone, bigger screen, bad battery life. Nexus 5, the pattern repeats again. Thankfully Motorola tend to understand battery life better than most and have bumped the mAh specs up nicely on the Nexus 6. Or put a different way, default Nexus 4 battery was 2100mAh, default Nexus 5 battery was 2300mAh. People were already complaining about battery life on the Nexus 4, so why did they only bump up the battery capacity by so little for the Nexus 5? For comparison, note that a phone known for great battery life, Motorola Droid Razr Maxx, came with a 3300mAh battery and was still a slim phone. My point is, just because it's the right thing to do to bump up battery life when using a bigger screen, doesn't mean that the manufacturers will go far enough when doing so.