You can check battery usage under Settings > Battery to identify which apps are draining the most power on your iPhone or ...
Whether it's an OS update, a faulty battery, or a renegade app It's not uncommon for an iPhone battery to drain faster than ...
Hardware Issues - A weak or faulty battery can prevent proper power-up, nearly full storage can slow down startup or any physical damage to iPad or its component can affect hardware. How to Fix iPad ...