Upgradable PDAs

[The Grim Sleeper]

I am all for PDA upgrades, but downgrading the PDA, just so we can then upgrade that downgrade away seems silly.
Battery life would also interfere with Detomax Bombing, which is already a weak item, as people will turn their PDA off to save power.

I actually kinda like the idea of breakable screens. Sure, it would be a hassle, but if you can fix it, it would be a fun thing to do.