I just turned Airplane Mode on for my PW 2012, PW 2013, HD 2012 and HD 2013. I will only turn it off for specific syncing before and after a reading session. I'll leave it on during the session to minimize button presses. That should save lots of power.
Also, I'm leaving Location Based Services off for both the HD 2012 and HD 2013. On occasion that item draws unneeded power in large amounts. That function is really only used by Amazon and App producers to gather geographic data on how their software use is distributed.
When expecting a firmware upgrade (reading about it in this Forum), then leave Airplane Mode off all the time until the upgrade is installed.
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