For a DAP without a built in amp, isn't 12 hours of minimum playback a bit lacking? I'm thinking of 20-30 hours or so, the space for more battery is available anyway.
I hate recharging finding my AK120 in a low battery state after 3 days of non-continuous playback (usually only 2-3 hours /day)
I'm trying to encourage high SQ with minimal bells and whistles, to keep the parts cost (and size) down - all to achieve a larger market. Personally, I can't remember the last time I was deprived of access to an AC outlet (for recharging) longer than about 8 hours, but 12 hours or even more would be nice, surely.