as mujja says , it's normal .I have a Navman PIN570 [I think AcerN35 clone], running WM2003 and I've let the battery run down a few times and I've lost all my programs . Easily put back but still a farce .I bought some solar chargers from ebay so I have no excuse not to charge it up. In the settings you can close down the programs running . Theres one or two nice battery level reminder programs for these things , I use Batti , it's a coloured bar across the top of the screen to tell you the charge level and theres a warning tone if it drops too low .My Ubiquio401 phone/PDA runns on WM5 and as said never loses settings or programs even after a soft re-set.