PowerBook Duo 210, 230, 250, 270c, and 280 computers include a 25 watt (W) power adapter. The PowerBook Duo 280c includes a new 36 W power adapter which is fully backward compatible with all Duo computers.
The two power adapters can be identified by the model number listed on its bottom label: M7783 - 25 W adapter M2693 - 36 W adapter.
Although the 36 W adapter can be used with all Duo computers, it is not recommended to use the 25 W adapter with the Duo 280c system. Use of the 25 W adapter may cause the battery to drain while using the system in certain configurations and usage patterns.