Know how electricity at home is still being used even when appliances are turned off, because they’re still plugged in; same goes for your smartphone. If your phone’s power seems to weaken at some point during the afternoon it could be a few things. Make sure your screen isn’t too bright; keep your phone out of the sun; too many wireless radios enabled, when not in use, eg/ your GPS; the main culprits are the apps and the ads in the background that push info to your phone.
Be sure to read all app comments before downloading apps; some apps have embedded dynamic ads that eat up your batteries life. Lock your smartphone when not in use; download your latest software updates; many androids have a power save mode; take advantage of it.
