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windows-battery-notification
Notified when your laptop battery has been fully charged where Windows OS will not be able to help you as such
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battery-notifier
Scheduled toast notifications in your Windows system regarding battery charge level
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
https://github.com/krsntn/windows-battery-notification (you would have to change the program's threshold values - open it in a text editor and change 96 to 80 and 18 to 20)
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.