Hi, I have a verizon Iphone 5 which i got around February. So far everything is great, and i have it jailbroken with minimal tweaks. However, after looking at an battery app, I noticed my battery's maximum capacity is hovering around 1360 mAh, compared to the 1440 mAh it should be. It fluctuates everyday, but never gets past 1400. Should be concerned?