It's perfectly find to charge your iPhone multiple times per day. If you are an intense gamer, you might want to consider one of the new iPhone game controllers. They bring physical controls to the iPhone for games and double as extra battery power. There are a few options, the MOGO Ace and one from Logitech.
Thank you both of you but as I have looked up on internet about most phones and their batteries it's quoted that you need to keep them between 40% to 80% and do a full charging cycle once I. A month. What is your say?