@iandix, I mean "full reading" have the device most of time powered on reading in a day (for example, 8 or 10 hours reading).
Does Airplane mode disable the CDMA modem? Because I think the problem is there: the CDMA modem tries to connect and as I'm in Spain it uses all battery retrying connection (The same happens with my old US Kindle: if I power on connection, it eats the battery in two days. With modem disconnected I only need to recharge it once or twice a month).
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