The battery source information tells me that over 75% of the battery is used to maintain the cell radio/phone standby function. How can I disable this standby function so that the battery can be used for other things. At this time, the battery will last no longer than 1 hr and this is not very efficient . Is there a way to do it? So far, I cannot figure it out on my own. Please help.... p.s. the tablet is: EPad ZT-180 Android 2.2 ( 10.2" ).