Has anyone else noticed when the batteries are in good health they hold their charge, if i charge it to 80, a month from now it will be at 79-80, but batteries near the end of their capacity/life lose charge when not used, if i charge my 5 year old laptop to 100% and not use it, in a month it will be down to 25% or less, and my PDA will go from 100% to 0% in just over a week.