We believe that our PalmOS PDA's battery are very stamina. But we don't know actually how long it be. This paper I found from umtproducts.com ,which provide the work measurement software, gonna telling us that. They try to set the working condition to find out how long the battery could be if your PDA are working continuously without automatic shutoff. I think we can use this information to evaluate whether our palm should be replaced the battery or not? Cheers...