Android smartphones are powerful, but unfortunately, they don't have endless battery life. In fact, many Android phone users would be happy to make it through a single day, hoping that a nightly recharge is sufficient. A number of factors have conspired to reduce gadget endurance over the past several years. Thinner designs with less room for batteries, larger and brighter screens, faster quad-core processors, more software that runs in the background, and power-hungry GPS radios all share responsibility. The move from 3G to 4G networks a few years ago—particularly of the LTE variety—has also taken its toll. These tips should apply across just about any Android phone. Try these tips to extend your handset's battery life: 1.          Use a dark background.  If you use a phone with an AMOLED screen, using black or dark wallpaper can save the battery.  This is because such screens light up only the colored pixels while black pixels remai...