PSP dry battery - some annoyances, nothing harmful

I let my PSP battery run dry. Not on purpose, but I just didn’t charge it for a while but still played with it. It wouldn’t boot without a charger. With charger, it first showed me some Japanese greeting when trying to exit the game that was automatically booted when turning the thing on, then showed a screen which said to me nicely in 15 languages that “settings have been corrupted” and then it ran the same sequence as when first initializing and booting the device.

I had to choose the timezone again. Interestingly, the clock was still accurate — could it be that it kept running with the last bits of remaining battery? Or could it be that it’s stored in some sort of NVRAM or even on Memory Stick? Hmm, now that I think of it, my mobile’s clock remains correct even when I remove and reinsert the battery — how does that go?

Anyway, all the savegames and files and other info were on non-volatile Memory Stick anyway, so no harm there. And the only info I really lost was the WiFi network configurations, which was a bit of the same, as I now must walk through them again and set the passwords and all that. But other than that, nothing irreversible happened with the battery reset.