In my product i am using a wifi module requires 3.3v and a bunch of other components requires 5v. For this i am using 3.7v 3000mAh battery. So here i have a doubt whether to use which case or any other suggestions
case 1: To use two 3.7v battery in series becomes 7.4 so that i can use a 3.3v regulator to convert from 3.7 and a 5v regulator to convert from 7.4V as in below fig.
case 2: Use one 3.7v battery and use a 3.3v regulator and 5v booster(if this please suggest a good circuit or module). If i use this does the power consumption increases and batter level reduces in short time? or it doesn't?