To get the most out of your smartphone's battery, you'll need to charge it properly.
Most Smartphones have a lithium-ion battery that lives longer when charged regularly. Unlike the nickel batteries used in older phones, lithium-ion batteries do best when kept above a 50 percent charge. Repeatedly allowing the battery to drain fully may shorten its life and decrease its overall capacity.
If this happens, you'll need to charge the battery more frequently and it may last only a few hours before needing a charge, for example.
Leaving the phone connected to the charger (when the phone is completely charged) while you are using it may lower battery life if you do it repeatedly.
I've also heard others who will only charge their phone when it's completely dead but it's true for lithium ion batteries to keep them charged and have over 50% power
