Even in 2015, it's tough to go much longer than 24 hours without charging your smartphone. Better battery technology simply hasn't arrived yet, which means it's down to software and settings to eke out the limited power for as long as possible.
In fact, these types of batteries suffer from low voltage problems, so it's actually better to partially charge them (say, from 20 percent to 90 percent) than to fully charge and fully drain them.
Few suggestions to extend your smart phone battery life.
- Black wallpaper can save battery
- Use dark themes and settings
- Don't use adaptive/auto brightness