I just tried to use the new ART runtime on my Nexus 4 witch Stock Android 4.4 by enabling it under developer options. It needed a reboot. Before reboot happened, the battery level on Nexus 5 was ~44%. But when reboot finished with the upgrading apps message on screen, the battery died to zero and phone was shut down. I had to use the charger again to boot it. So what the battery drain to zero means for Nexus 4 with ART runtime? Has anyone else experienced it? or we cannot use ART on Nexus 4? Atm, I reverted back to Dalvik again.