Nokia N81 - Manual (Page 134)

Battery information
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from an authorized Nokia dealer, look for the Nokia Original
Enhancements logo on the packaging, and inspect the
hologram label using the following steps:
Successful completion of the four steps is not a total
assurance of the authenticity of the battery. If you have any
reason to believe that your battery is not an authentic,
original Nokia battery, you should refrain from using it, and
take it to the nearest authorized Nokia service point or dealer
for assistance. Your authorized Nokia service point or dealer
will inspect the battery for authenticity. If authenticity
cannot be verified, return the battery to the place of
purchase.
Authenticate hologram
1 When looking at the hologram on
the label, you should see the
Nokia connecting hands symbol
from one angle and the Nokia
Original Enhancements logo
when looking from another angle.
2 When you angle the hologram
left, right, down, and up, you
should see 1, 2, 3, and 4 dots on
each side respectively.
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.