Battery Overview 2.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This software for Mac OS X was originally developed by Andreas Fertig.
From the developer:
Battery Overview shows the battery status of all Apple devices in a single application. It is located in the status bar, taking up as little space as possible. In the status bar, Battery Overview shows only the lowest percentage of all battery statuses. Of course, in a small space-saving way. By clicking the icon in the status bar, you can see at a glance information about all currently connected devices.
You may want to check out more software for Mac, such as My Batteries, Battery Diag or Battery Monitor, which might be similar to Battery Overview.
Utilities
Battery Utilities