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Kingreaper comments on Lifelogging: the recording device - Less Wrong
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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.
Wouldn't it be possible simply to carry 2 uCorders, and swap then every 2 hours?
Putting the one that is not in use onto the USB battery.
Sure, but then we are well past trivial inconvenience and into real inconvenience.
I mean, if you don't mind the constant switching, you could just buy six of these at around ~$120 and switch every 2 hours!
(Significantly cheaper too: 120 vs 180+USB battery.)