The best alternatives to Smart Battery Monitoring are Indiegogo, Battery Indicator, and Greenify. If these 3 options don't work for you, we've listed a few more alternatives below.
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Greenify help you identify and put the misbehaving apps into hibernation when you are not actively using them, to stop them from lagging your device or leeching the battery, in a unique way! They can do nothing without explicit launch by you or other apps, while still preserving full functionality when running in foreground.