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I've made a few test with Wi-fi both on and off. Didn't try apps that made the device go in deep sleep as I suspected there was something waking the reader up in some occasions and I was trying to figure out what it was: while I had the Carta Rom I randomly found the screen saver images blanched out. However it didn't happen with the original FW back and app to scan battery activity weren't helpful.
When in use though, battery didn't seem to deplete too fast, the problem is that due to the issue above I never got below a certain level due to the stand-by drain.
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