Acer C720 - Manual (Page 27)

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try to keep the battery between 15° C and 25° C (59° F and 77° F). A
device with a hot or cold battery may not work temporarily, even when the
battery is fully charged. Battery performance is especially limited in
temperatures well below freezing.
Do not dispose of batteries in a fire as they may explode. Batteries may
also explode if damaged. Dispose of batteries according to local
regulations. Please recycle when possible. Do not dispose as household
waste.
Wireless devices may be susceptible to interference from the battery,
which could affect performance.
Replacing the battery pack
The notebook uses lithium batteries. Replace the battery with the same
type as that which came bundled with your product. Use of another battery
may present a risk of fire or explosion.
Warning! Batteries may explode if not handled properly. Do not
disassemble or dispose of them in fire. Keep them away from
children. Follow local regulations when disposing of used
batteries.
Radio frequency interference
Warning! For safety reasons, turn off all wireless or radio
transmitting devices when using your laptop under the following
conditions. These devices may include, but are not limited to:
wireless LAN (WLAN), Bluetooth and/or 3G.
Remember to follow any special regulations in force in any area, and
always switch off your device when its use is prohibited or when it may
cause interference or danger. Use the device only in its normal operating
positions. This device meets RF (Radio Frequency) exposure guidelines
when used normally. It should not contain metal and you should position
the device the above-stated distance from your body. To successfully
transmit data files or messages, this device requires a good quality
connection to the network. In some cases, transmission of data files or
messages may be delayed until such a connection is available. Ensure that
the above separation distance instructions are followed until the
transmission is completed. Parts of the device are magnetic. Metallic
materials may be attracted to the device, and persons with hearing aids