some of my friends use power/energy/battery-savers. i think you don’t need this for android devices (unless you run an old android version maybe).
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to save battery i simply use a night mode-app in the dark and turn off wifi since it keeps scanning the area for available networks. gps can stay on because it only gets activated when in use. this is shown in the statusbar.
sometimes i turn of sync and when my battery is almost gone i switch into flight/offline-mode.
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what do you guys think about power saving and have you got any experiences to share?
glad to hear from you!