Huawei C2807 User Manual page 21

If there is battery deformation, color change or abnormal heating
while you charge or store the battery, take it out immediately and
stop using it. Otherwise, battery leakage, overheat, explosion, or
fire may occur.
When installing the battery, do not push the battery by force lest
battery fluid leak out or the battery crack.
Do not take out the battery when the phone is turned on.
If you do not use the battery for a long time, store it in normal
temperature after charging.
Charger
Use the charger approved by the phone manufacturer only. Any
violation of this rule may result in fire or malfunction of the
charger.
Do not short-circuit the charger. Short-circuiting the charger may
cause fire or malfunction of the charger.
If the power cord is damaged (for example, the lead is exposed or
broken), or the plug becomes loose, stop using the cable at once.
Otherwise, electric shock, short-circuit of the charger, or fire may
occur.
Keep the charger dry. Once water or other liquid leaks into the
charger, electrical leakage or other faults may occur.
Do not use the charger in a dusty and damp environment. Keep
the power cord away from any heating appliance.
Ensure the charger is properly plugged into the power socket
when charging the battery. Improper insertion may result in
electric shock, fire, or explosion. To unplug the charger, pull the
plug off rather than tear the power cord.
Use the AC power supply defined in the specifications of the
charger. An improper power voltage can cause fire or malfunction
of the charger.
18