If you have a battery problem you should check out the newer transmitters. The one I have plugs into the car lighter AND has an additional power source for CD players (with multiple jacks). That way you don't even use up your CD player batteries.While the second won't help with the Clie, you CAN buy a splitter that allows you to connect more than one cig. lighter adapter to the car, but be warned! If you leave them all plugged in you can drain a weak (or heat stressed) battery. A healthy battery should be able to handle the occasional drain if you do forget to unplug...
Also, I ditched my cassette adapter because the rattle it made was too annoying vs. the cleaner sound of the transmitter.
Donna in Dallas