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Excessive battery drain during sleep

What is it

The MacBook's battery is drained overnight or while it is being transported in a backpack, bag or luggage.

Causes

There appears to be multiple causes for excessive battery drain while the Mac should be sleeping. These include, but are not limited to the following.

Solutions

The key to solving excessive battery drain is to determine the cause. By running Sleep Aid on your Mac, it will record activities during sleep and will attempt to determine the cause for you.

These events will show up in red in the Sleep Aid history view, selecting the red area will reveal details in the sidebar.