foucist has suggested that one quick route to a lifelogger is to modify the uCorder to have longer battery-life, since it is almost perfect in every other respect. The uCorder recharges through its USB port, so one could hook it up to a USB battery.

USB batteries are popular for things like iPods, so we benefit from economies of scale; it seems possible to boost recording time to upwards of 10 hours with a USB battery like this $42 one.

Unfortunately, foucist also found that the uCorder manual says it cannot record while charging, and presumably wouldn't automatically draw on the battery anyway. So this wouldn't work (without a lot of manual intervention, and the uCorder takes hours to recharge...)

But the basic idea is sound - we just need to find a nice recorder which will run off a battery pack.