Nokia N90 - Manual (Page 12)

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For availability and information on using SIM card services,
contact your SIM card vendor. This may be the service
provider, network operator, or other vendor.
Enhancements, batteries,
and chargers
Always switch the device off, and disconnect the charger
before removing the battery.
Check the model number of any charger before use with
this device. This device is intended for use when supplied
with power from the DC-4, AC-3 and AC-4 charger, and
from the AC-1, ACP-7, ACP-8, ACP-9, ACP-12, LCH-8,
LCH-9, or LCH-12 charger when used with the charger
adapter CA-44 delivered with your phone.
The battery intended for use with this device is BL-5B.
Warning: Use only batteries, chargers, and
enhancements approved by Nokia for use with this
particular model. The use of any other types may
invalidate any approval or warranty and may
be dangerous.
For availability of approved enhancements, please check
with your dealer. When you disconnect the power cord of
any enhancement, grasp and pull the plug, not the cord.