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Notebook battery drain meter (NDM) is a freeware very simple application running under Windows platform (tested on XP and 7, requires WMI - should be present on current Win OSes). It solves a problem of observation and alerting of NB power consumption when running on batteries. NDM works as follows:
Decompress the app into desired directory and run.
NDM creates TRAY icon, which shows current power drain from battery in Watts.