So I'm looking for an App that rings an alarm when my iOS devices are hitting 80% while charging. So far I've only found several apps that would notify me when the device is fully charged. Any chance there is an app out there that lets you set a custom alarm regarding the battery percentage? Please don't try to teach me anything about batteries and if it's good if you don't regularly charge them to 100%. I've had very good experience with the longevity of my batteries when I only used them between 20 and 80%. I am thankful for every hint regarding an appropriate app.