I wouldn't even consider myself a heavy user. If I use the GPS for 3 hours, it wipes out 50-75% of my battery. This is why I always have the cable with my when i drive so I can connect to the car charger. and iphone battery extender is very fittable for me. I DO however like the fact that the phone doesn't get nearly as hot while using the GPS. That is certainly noteworthy. But yes, I would likely consider getting an extended batter pack for my 5 and JIAYU G3.