Download of YaBattery 1.6 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software is included in System Tools. This Mac app was originally developed by Andreas Fertig.
From the developer:
YaBattery gives you a comprehensive overview of your battery. Among other things, this application displays the number of charge cycles, the current capacity, and the date of manufacture of your MacBook battery. YaBattery shows up in the menu bar as a small space-saving icon in which the remaining battery time is displayed.
You may want to check out more software for Mac, such as DssW Sleep Monitor, iPodBatteryIndicator or Battery Checker, which might be similar to YaBattery.