http://h18007.www1.hp.com/support/files/HandheldiPAQ/us/download/22883.html HP has an update to ROM 1.10 that fixes a problem with the battery capacity value. It is an XIP ROM update (as all updates from OEMs should be) so this won't take up any of your memory, nor will it go away should you hard reset. Note though that once you apply this update, you should immediately back your device up and discard any older backups. Restoring a backup from an image that had a different ROM can cause problems. It is a 5-6MB download and currently available in English, Spanish, German and French. The Japanese update reads 0MB, so that one is probably still getting the finishing touches put on it. You must have
ROM 1.10 installed before applying this update. There is a warning on the HP site that there is a problem with the 1.10 ROM and the extended battery. You
should be OK in installing it anyway and then applying this patch if you have been holding off.