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The Chinese seller's ereader is a 4.3" 800 x 600 pixel screen vs this 4.2 inch, 400 x 300 pixel project.
The Palm Z22 lasts an evening anyway, its cell is about 15 years old and you'd expect not much more than 6 years. Most original Kindle Keyboard need new cells about now (10 years old and about $15 for replacement, easily opened. No soldering.). I bought it recently out of curiosity. By 2005 the PDA was an almost dead thing, only surviving on price. So Z22 was relatively cheap compared to a smart phone at about $100. Main selling point was Digital Personal Organiser with Sync. I'm using a Linux program that was in the main Mint GUI Software Manager "store". The Z22 display was really obsolete even then. I had a Nokia Communicator in 2000 (the 486 based mono one) and then the ARM based mkII of the N9210i in May 2002. I still have the email from O2 with the settings for it. The earlier colour N9210 had a more limited Mobile modem and CCFL backlights. The "i" version has an LED backlight. It was a company phone. The innovation of the iphone was purely the data-package making internet browsing affordable. Capacitive touch was 15 years old, the GUI was bought in, CPU was Samsung. Basically off the shelf parts glued to a iPod. The competition had been copying the earlier Palm and early Newton by having high resolution stylus input for touch and handwriting (or in Win CE the stupid scaled down Win95 interface on 320 x 240 pixels typically). Most WinCE PDAs and phones had 320 x 240 screens (1/4 VGA), though one of the last Palm PDAs had 320 x 320 instead of 160 x 160. You don't want to play Mahjongg Solitare on 160 x 160, even in colour!
The best S/H Palm to get is one that takes batteries. Many of the ones using a built in cell can't easily be opened with cracking the LCD. Adobe did a PDF reader for it!
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