Sorry but I can't find this question when I do a search. I'm a newbie to active basses. I just got a new TBC J-bass and it seems the battery only lasts a week, even if I rarely play it. I don't leave it plugged in. What could be the problem? Should I buy a BassMods preamp and replace the supplied one? I love the sound and the feel of the TBC, but I'm feeling that there is something wrong here. Please help.