Hot swappable powerbook battiers

[rationull]

I've heard that powerbook batteries are hot-swappable, as in you can sleep the machine and remove the battery, and even if not plugged into AC power you have about a minute to put in a new battery, courtesy of a small backup battery.

I've also heard this feature is not present in the 12" models. Does anyone know if this limitation is true?

[Giaguara]

It is true. The current (from when the 12" and 17" PBook models were introduced > now) Powerbooks have that feature, excluding the 12".