first of all i dont leave the cable connected to the guitar
secondly i may exagerated a bit, lets say that when i play 1-2 hours plugged in without stopping then my batteries are starting to run low, i also have a tuner built in the preamp, and yes i do have rechargbele batteries...maybe i should go to the tech and check it out...
anyhow, IF i buy another electric acoustic i wouldnt never buy one with batteries, becouse you have today good system that dont require batteries...like the K&K.