There are many kinds of mobile user at home and abroad. All people are not so much experienced about that. Due to full charge, overloading charge of battery, battery may be damage.
So always try to be charge your mobile battery with a perfect time. First time must give 8 hours charge, after that don't give charge more than 2 hour. Every month 2 times must empty your mobile battery to protect battery from unexpected situation and to increase longevity of mobile. Its very difficult to protect mobile from every interrupt. High voltage of electricity, overloading of charging battery, high temperature may be harmful for your smart phone, iphone or any kinds of mobile.
So please try to avoid such situation, dont try to charge your mobile in all steps. Your battery consists of 3 ot 4 steps. So after 1 step you may charge your mobile, after 2 step you may charge your mobile, after 3 step you may charge your mobile. But its strongly recommended for you, for your mobile and also for mobile battery after 4 step you have to charge your mobile. In different step you have to ignore to charge your mobile. You can safe your mobile and your mobile will be more effective long times. So keep your mobile safe, protect your mobile from high temperature, overloading charge and always secured from others effect.