It's never a Psion without that sweet spring-loaded hinge design they developed to contain the double A batteries on most of their PDAs, variations of which wer

It's never a Psion without that sweet spring-loaded hinge design they developed to contain the double A batteries on most of their PDAs, variations of which were used on the great 3 and 5 series. It was oddly satisfying just playing with the mechanism, easily one of the most over-engineered parts I've seen on a clamshell style computer.