So wait. Lemme get this straight.
The LT does not have batteries. The LT cannot play CD games without an add-on. The LT has a rather awkward looking controller. And it is more expensive than a duo.
So really, it makes no sense to buy an LT; just get a car adaptor and monitor for your duo and take that instead.
The LT is the coolest piece of video game hardware, ever. (note, I didn't say best, just coolest). It's the same footprint as a PCE, serves all the same functions and hooks onto all the same attachements as a PCE, and has a built-in, fold down, generously sized LCD screen with a TV antenna. It has a normal controller port, but the full fuctions of a PCE controller are built into the system. You can hook this thing up to a CD interface/super CD unit and play the games on the LT's screen.
Now, the one drawback was you needed on AC adapter for the LT and another for the CD unit. I know they made a battery pack for the duo and a car adapter. Two things I don't know:
1. If the Duo battery can be used on a LT/CD system.
2. If they made a car adapter for the CD-rom units. (they did for the LT) Or, can the DUO car adapter be used on the CD Interface or SCD unit.