Acer ASPIRE E5-771G-56U 17.3 SILVER NX.MNVEG.027 Data Sheet

The computer uses an embedded Lithium battery that gives you long 
use between charges.

The battery is recharged whenever you connect the computer to the 
AC adapter. Your computer supports charge-in-use, enabling you to 
recharge the battery while you continue to operate the computer. 
However, recharging with the computer turned off significantly 
reduces charge time.
The battery will come in handy when you travel or during a power 
failure. 

Plug the AC adapter into the computer, and connect to a mains power 
outlet. You can continue to operate your computer on AC power while 
your battery is charging. However, charging the battery with the 
computer turned off significantly reduces charge time.

Before you use a battery pack for the first time, there is a conditioning 
process that you should follow:
1. Connect the AC adapter and fully charge the battery.
2. Turn on the computer and complete setting up the operating system.
3. Disconnect the AC adapter.
4. Operate the computer using battery power.
5. Reconnect the AC adapter and fully charge the battery again.
Follow these steps again until the battery has been charged and 
discharged three times.