I left the S-mod running on loop and it lasted about 8 hours if not a bit more.... I'd say that is not bad considering the chips its running and the sound quality it produces. Isn't the 901 around that time as well? :P Of course if I was being OCD I could make it run out in 5 hours. But that was the same for the DX100 when constantly touching the screen.
10/21/14 at 11:49pm