The first few days I had mine it was dead at the end of the evening. Maybe the 5 or six program uploads plus me never putting it down had something to do with it. By setting my screen at twenty seconds and mid brightness I can get two days heavy use. I also turned off the RF, not sure how much of a difference it will make but I don't think it can hurt. My suggestion, keep the charger handy and dock it there every night. Li-Ion batteries don't have the usual memory problems and in most situations will last about two years regardless of charge cycles.