Microsoft Surface Pro User Manual page 25

When you see a low battery warning, plug your Surface Pro into an electrical outlet. If you don't recharge the
battery, Surface will eventually save your work and shut down.
Notes
It takes 2-4 hours to fully charge your Surface Pro battery from an empty state.

Surface Pro can't be charged through the USB port. Instead, you need to use the included power supply,

the Docking Station, or the Car Charger.
Battery: Make it last
Here are some ways you can make your battery last longer:
Reduce the screen brightness.

The brighter the screen, the more power it uses.
Choose a power plan that saves power.

Surface uses power. To learn more about power plans, see
Windows.com (Surface Pro doesn't support InstantGo).
Turn off or remove devices that you aren't using.

you might want to unplug devices that you're not using.
Turn off Wi-Fi.

open the Settings charm, tap the wireless network icon (
48W power supply with USB charging port
The 48-watt power supply included with your Surface Pro has a USB
charging port that you can use to charge other devices (like a phone).
If you want to use a USB device with Surface, plug it into the USB port
on Surface. For info about this, see
The 24-watt power supply (included with Surface and Surface 2) can be used to charge Surface Pro, but the
charging will take longer.
Car Charger with USB Port
You can use the Car Charger to charge Surface and another USB device (such
as your phone), while you're traveling in your car.
To charge Surface using the Car Charger:
1. Plug the Car Charger into the vehicle power port or cigarette lighter
in your car.
2. Connect the power connector to the charging port on Surface.
© 2014 Microsoft
Open the Settings charm, tap or click Screen, and then adjust the slider.
If you don't need Wi-Fi for a while, you can turn it off to conserve battery life. To do this,
Connect devices
A power plan is a collection of settings that control how your
Power plans: Frequently asked questions
Many USB devices use power when connected, so
), and turn on
in this guide.
Airplane mode.
on
Page 19