You arent tethered to a power source and you can get a reasonable amount of use, 3-5 hours, out of the battery.

As batteries age though, the amount of use you can get out of a single charge depletes so users tend to look for a way to make the battery last longer.

There are some settings you can change that will give reduce battery usage when your MacBook is idlein sleep but theres not much you can do out-of-the-box to reduce power consumption when youre actively using it.

In three hours of heavy usage (multiple Chrome windows open, screencasts recorded, files uploaded online), the battery was at 20 in 3.5 hours.

If Apple were to add one, it is possible it may only work on newer MacBook models.

There are other apps similar to Endurance and they may be worth checking out too.

If your Mac exceeds a predefined temperature, Power Nap operations are suspended so that your Mac doesnt overheat.

Use the Enable Power Nap checkbox to turn Power Nap on or off.

Computers with 2012 or an earlier year in the model name suspend Power Nap if the battery has a charge of 30 or less.

When connected to AC power, communications and data transfers are continuous.

To receive updates during Power Nap, Mail and Notes must be open before your Mac sleeps.

Power Hour App For Mac