use craftmans 19.2 volt batteries for laptop?
The use of the power tool battery to run the laptop is certainly a feasible idea. You will have to look at the range of input voltage that is acceptable for the Asus laptop to operate correctly and then determine if the discharge voltage curve of the battery will stay within that usable range. It is also necessary to determine if the battery has the power delivery capacity to supply the current needed to operate the computer. You could use the rating of the Asus supplied AC changing adapter as a guide to what capacity of battery may be suitable. 

The above discussion assumes that you are aiming to take the straightforward approach to power the laptop through its AC adapter charging port. Do note that this approach may not offer the highest efficiency of battery energy usage as there could be a double conversion going on inside the laptop power supply (i.e. from DC In to Internal Battery voltage and thence to the various computer DC voltages). It does require looking at the Asus laptop power supply schematic and architecture to see if this is the case or not.

Using an approach to substitute the power tool battery in place of the laptop's built-in battery is a much more complex task because you have to deal with the intricacy of how the cell stack is configured for load versus in the charging mode. Personally I would steer away from this approach due to the extra complexity even if it could lead to increased efficiency of energy usage.