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charged the next morning so they can unplug the computer and bring it to work. These activities happen at
approximately the same time each day. If this sounds like you, consider enabling nighttime charge
optimization for the battery.
Nighttime charge optimization affects battery charging during the night hours, the time when you’re usually
asleep. When it is enabled, the computer regularly adapts its charging behavior based on observation of
when you plug in the computer at night and unplug it in the morning. During the nighttime, the battery is
charged to a particular range and is kept within that range for an extended period, before being further
charged to 100%. Nighttime charge optimization ensures safe charging during the night and is beneficial to
the long-term health of the battery.
Note: With nighttime charge optimization enabled, if you break your routine one day by unplugging the
computer much earlier than usual in the morning, you may find that the battery is not fully charged.
If the battery pack of your computer supports nighttime charge optimization, it can be enabled in Lenovo
Vantage, Lenovo PC Manager, or Lenovo Smart Engine.
Recover full battery capacity
If your computer is constantly plugged in to an electrical outlet and the battery rarely discharges, the battery
may not be charged to its full capacity even if the battery meter reports 100% charge. You can recover the
battery’s full charging potential simply by discharging and re-charging the battery.
Step 1. Unplug the computer and use it until the battery charge drops below 20%.
Step 2. Plug in the computer and charge the battery to 100%.
Using a Power Delivery compliant USB Type-C charger with the
computer
The USB Type-C connector on the rear of the computer conforms to USB Power Delivery Specification. If
you did not carry the included ac power adapter with your computer, you have the option of using a qualified
USB Type-C charger (purchased separately) that is also Power Delivery compliant to charge the computer in
sleep or powered-off state. Lenovo branded USB Type-C chargers with the following listed maximum ratings
are tested to work with the computer. Chargers of other brands with the same ratings should also work but
are not thoroughly tested.
• 20 V, 4.75 A
• 20 V, 5 A
• 20 V, 6.75 A
• 20 V, 7 A
The rear USB Type-C connector is not designed as the primary power input connector. When the computer
is operating, the power supplied by the USB Type-C charger may be insufficient. As a result, the computer
may not operate at its full capacity and the battery charging may stop or is very slow. Use the included ac
power adapter whenever possible.
CAUTION:
When purchasing third-party USB Type-C chargers for use with the computer, choose a product that
is safety approved or certified. A disqualified charger may cause damage to your computer or pose an
electrical hazard. In many countries and regions, manufacturers or importers of electric chargers can
submit their products to a certification authority or approved and recognized testing laboratories.
Such a product usually carries a mark if it was tested to pass relevant quality and safety standards.
For some countries and regions, this certification process is even mandatory. If you live in mainland
China, choose a charger with the “CCC” mark; for users in many European countries, choose one with
the “CE” mark; for users in the United States and Canada, choose a Listed charger that carries a mark
by one of the Nationally Recognized Testing Laboratories. (For example, the “UL Listed”mark). For
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User Guide
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