My iQube never last more than 20 hours, it average around 15 hours per overnight charge. I'm using it with iPhone/IMod>iQube>JH13 and use it around 3 hours per night, it only last me around 4-5 days of listening before the LED blinking. I usually charge it from 11PM to 7AM. Is there something wrong with my iQube?
What batteries and charger are you using?
BTW iMod and iPhone? didn't know iPhone could be modded as well?