iBetterCharge monitors your iOS device battery level from a Mac
Keep an eye on your iDevice's battery level and get alerts when it's time to charge using a free app and your Mac.
Forgetting to charge your smartphone or tablet, only to realize the battery is almost dead when you're heading out the door is a bummer. If only there were some way for your Mac to alert you when your device's battery was getting low. Wait, there is.
After downloading and installing the app, you'll need to ensure that you have iTunes Wi-Fi sync enabled for the specific device(s) you want to monitor. After that, any time you want to check the current battery level of a device, you simply click on the icon in your Mac's menu bar.
Once a device is added, you can set when you'd like the app to alert you of a low battery. Currently, the options are 5, 10, 20, and 50 percent. You can even set iBetterCharge to alert you when a device is fully charged.
Naturally, alerts show up in Notification Center with an audible tone that's hard to miss.
I've been using the app over the last week with little issue. There have been a few times when a device randomly disappears from the list of monitored devices, but quitting and relaunching iBetterCharge usually fixes it.