What will I do with my iPhone?

I have an iPhone 32GB. I charge it everytime I reach 25%, sometimes I charge it when it reach to 10%. When I charge it, there are times that I have to unplug it and it only has been charged to 50%-70%. Should I drain my battery to zero? What should I do next?

NO ALWAYS TAKE OUT TIME AND SWITCH OFF YOUR CELL FONE AND LET IT CHARGE NICELY FOR HOURS Until THE MESSAGE POPS ITSELF TO UNPLUG
AND THE CHARGE COMPLETES 100%.

IF YOU CHARGE IT NICELY THEN YOU NO NEED TO WORRY

YOU CAN ALSO BUY PORTABLE MINI CHARGERS ALONG WITH YOU

Power cycling the iPhone, completely, once in a while is a great idea.

I always charge mine when its around 20% and have never had an issue, I never let it go to 0.