I have tried 3 different brands of Alkaline batteries, but I wont list the names. Then I tried these EBL 3000 Mah Lithium batteries. I had a smart charger.
These batteries last at least 20-30% longer in my 360LX and Compaq C-140. As someone else mentioned, do not charge these in the units, you have to have an external charger and make sure your settings on your Palmtop are not for charging, but running Alkaline (default setting).
Highly recommend these for grey scale Palmtops running Windows CE 1.0-2.0.
If anyone else has experience with these with any units running 2.11+ and color, plz chime in ;-)