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I don't know what the obsession is with USB charging and internal batteries.
I just had a rave in the lights thread because I finally quit using USB tail lights and the ones I have now are dirt cheap, take AAAs, last longer, are bright, and it's so easy to use them on multi-day tours as AAAs are ubiquitous and you can just pick some up a garage somewhere.
If someone did the same for a turn-by-turn GPS cycle computer it would be great.
One of the eTrex range most likely.
I wish they'd release one of the Edge range that took AA batteries. (I can't use an eTrex as they don't record power.)