All laptops have a feature that computes a set of functions upon reaching a pre-ordained battery level. your computer is probably configured to sleep once this level reaches 25%. you need to click on the battery icon (bottom right of the screen) then adjust the settings from within there.
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All laptops have a feature that computes a set of functions upon reaching a pre-ordained battery level. your computer is probably configured to sleep once this level reaches 25%. you need to click on the battery icon (bottom right of the screen) then adjust the settings from within there.
It sounds like your computer is set to go to sleep or hibernate when it reaches 25%.
You can check in your power options (Start ->Control Panel -> Power Options on windows XP)