Nokia N77 - Manual (Page 120)

Battery information
120
What if your battery is not authentic?
If you cannot confirm that your Nokia battery with the
hologram on the label is an authentic Nokia battery, please do
not use the battery. Take it to the nearest authorized Nokia
service point or dealer for assistance. The use of a battery that
is not approved by the manufacturer may be dangerous and
may result in poor performance and damage to your device
and its enhancements. It may also invalidate any approval or
warranty applying to the device.
To find out more about original Nokia batteries, visit
www.nokia.com/battery.