Source: https://depot.info.apple.com/batteryexchange/index.html
iBook G4 and PowerBook G4
Battery Exchange Program
In cooperation with the U.S. Consumer Product Safety Commission
(CPSC) and other international safety authorities, Apple is
voluntarily recalling certain lithium ion rechargeable batteries
that were sold worldwide from October 2004 through May 2005 for use
with the following notebook computers: 12-inch iBook G4, 12-inch
PowerBook G4 and 15-inch PowerBook G4. These batteries were
manufactured by LG Chem, Ltd. of South Korea.
The affected batteries could overheat, posing a fire hazard to
consumers. Apple has received six consumer reports of these
batteries overheating. If you have a recalled battery, please stop
using it and order a replacement battery immediately. Once you have
removed the battery, plug in the AC adapter to power the computer.
If you must temporarily use your computer with the battery, do not
leave it unattended and check for signs of overheating.
Apple has initiated a worldwide exchange program and will provide
eligible customers with a new replacement battery, free of
charge.
Identifying your battery
The recalled batteries include those with model numbers A1061,
A1078, and A1079 and serial numbers that begin with HQ441 through
HQ507 and 3X446 through 3X510. To view the model and serial numbers
labeled on the bottom of the battery, you must remove the battery
from the computer. The battery serial number is printed in black or
dark grey lettering beneath a barcode. See photos below. Please use
the chart below to identify the battery model and serial numbers
that apply to your iBook or PowerBook.
Computer model Battery
model number Battery serial
number range
12-inch iBook G4 A1061 HQ441 HQ507
12-inch PowerBook G4 A1079 3X446 3X510
15-inch PowerBook G4 A1078 3X446 3X509



Click the images for a larger view.
Note: If your battery serial number does not match the requirements
listed above, you do not have to exchange your battery.
National and regional resellers, catalogers, and Apple's on-line
and retail stores sold the computers with the batteries from
October 2004 through May 2005 for between US$900 and US$2300. These
batteries were also sold separately for about US$130.
The Exchange Process
To begin the battery exchange process, you will be asked for the
serial number of your iBook G4 or PowerBook G4, the serial number
of your battery and a ship to address.
After serial number verification, a new battery will be shipped to
you, free of charge. When you receive the replacement battery,
please use the same shipping packaging and included prepaid
shipping label to return the recalled battery to Apple.
If you have recently purchased an extra or replacement battery for
any of the computer models noted above or a 12-inch iBook G3,
please check the battery's serial number to see if it needs to be
exchanged.
Thank you for your cooperation with this exchange program.
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Pls take note...