Holy moley that was a lot of downloading, but following your instructions, it works!
But surely there's gotta be a simpler way of doing this? When I make a video review of the PSP version of Tales of Eternia, fans will no doubt ask me how to play without the damn battery gauge always visible. Couldn't there just be a .ips patch for the .iso or something?
What's interesting is by removing the always on battery gauge, the filesize of the iso shrinks from 666.9 MB to 638.4 MB. That's a 28.5 MB difference. Can the battery gauge info really account for all the extra size?