A method for predicting battery power usage includes, collecting information relating to battery power consumption due to tasks performed by the physical computing system powered by a battery, and notifying a user in response to a determination that tasks associated with an upcoming event stored in a calendar application of the physical computing system are projected to exhaust the battery. A computing system includes a processor, a memory communicatively coupled to the processor, and a battery to power the computing system. The processor is configured to collect information relating to battery power consumption due to tasks performed by the computing system, and notify a user in response to a determination that tasks associated with an upcoming event stored in a calendar application of the computing system are projected to exhaust the battery.