Newer appears to have 2 for my iBook:
Newer Technology NuPower Battery 59 Watt-Hour High Capacity for all Apple iBook G3/G4 Models with 14"/14.1" Screen. *Up to 7% More Capacity vs. Original Battery!* New w/1yr NewerTech Warranty. (NWTBAPIB4148V40) more info... $109.99 Same Day
Newer Technology NuPower Battery 71 Watt-Hour High Capacity for all Apple iBook G3/G4 Models with 14"/14.1" Screen. *Up to 29% More Capacity vs. Original Battery!* New w/1yr NewerTech Warranty. (NWTBAPIB4148V48) more info... $119.99 10 Days
Apple appears to have one:
A 61-watt-hour rechargeable lithium ion battery that provides up to 6 hours of operation depending on battery saving features used and system configuration. This battery is compatible only with 14-inch iBook having two USB port $129.00 24 hours
Anyone care to weigh in on the pros/cons?