OK, I quizzed one of my sons who had a similar problem with his Nook. We used the latest version of esfile explorer (160.0.0.1) on my PE to turn on root privileges and delete phone.apk and telephony.apk from the system folder. After a power cycle the "eDGe idle" entry in the battery use table is just 4% instead of 78%. I'll see if this translates to longer battery life. My son said it gave him a couple more hours on his rooted Nook.
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