Nokia 2125i Reference Manual page 19

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.
2. When you angle the hologram left, right, down, and up,
you should see 1, 2, 3, and 4 dots on each side respectively.
3. Scratch the side of the label to reveal a 20-digit code, for
example 12345678919876543210. Turn the battery so that
the numbers are facing upwards. The 20-digit code reads
starting from the number at the top row followed by the
bottom row. Confirm that the 20-digit code is valid by
following the instructions at www.nokia.com/batterycheck.
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