Unfortunately, this means a battery pack rated at 5,000mAh will only provide about 2,500mAh to the iPhone. Testing shows that MagSafe can charge at a much higher efficiency, around 70%.

If you want to extend your iPhone’s battery life, avoid these 5 charging mistakes. 1. Using Non-MFI-Certified Charging Cables One of the most common mistakes iPhone users make is using non-MFI ...