Nickel Metal Hydroxide.... no Lithium Ion batteried PB 5300's are in public circulation to the best of my knowledge (and I don't think any made it past internal testing and early seeding... they exploded during charging). If you really have a LiON batteried 5300 lets talk... what do you want for it? But I agree on the battery life... it just seemed like it never died, and never lost its life-span. I could go a whole evening on a charge easily. Way better life span then my 1400 (which even with a new battery was lucky to get 1.5hrs, now I get 30-45 minutes on a charge) The only recurring problem with the 5300 AFTER it has been put thru the repair extension program, is the screen cable tends to fray and break. Other than that, a repaired 5300 is a very good reliable unit. I actually miss the size (why do all computer makers assume everyone wants a huge screen? I want a portable computer... give me a 10.4" 800x600 screen, thin and light.... I don't want these 15" wide screen designs) -chris <http://www.mythtech.net>