Battery Watcher is a stupid little menubar app I made for a colleague at work who never used to listen to his battery alerts. I gave it character, and made it more aggresive when the level got lower. Guess what... his Macbook has never died since!
In the latest version, it thanks you when you plug in your charger when your level is low. Treat your laptop with respect, folks!
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Like it! I just recommend change the menu bar icon, it's really colorful in comparison to other common icons
Battery Watcher