Hi there!
I've got an iRiver h140 (rockboxed) with SP-CMC-4U (low sens mod) mics! External power supply is a SP-SPSB-10 battery module with (according to soundprofessionals.com) 12V power, though I've never seen a battery of 12V being that small!
So what would be the maximum battery running time when recording in wavpack format @ 44.1kHz stereo with hold switched on?