I have a SL5500 running the Cacko ROM. I've tried a few other ROMs and don't think that is the issue. My Z drains the battery from full charge to a point where it won't turn on without external power in about 5 hours. This is when the unit is turned off. I initally thought it might be the battery and then charging system so I bought a new battery and the external charger. This didn't make a difference. Does anyone else have this issue or a fix for it? I can't figure out what is drianing the power. I have also removed the CF card and I do not have the home on SD. So confused.