[sirmaru]

It's true that the Fire goes into Sleep Mode when charging. However, if one is not charging overnight, then one should leave it in Shut Down Mode.

There is no question that, when not charging, Sleep Mode drains the battery about 2% every 3 hours. In Shut Down Mode, there is no drain at all for even 10 hours.

If the Fire issues an auto Shut Down request, allow it to happen and start charging as soon as possible. Evidently, that is a protective routine built into the Fire and, neglecting it, could destroy the battery.

Leave WiFi on all the time for syncing eBooks and upgrades to Apps and the Firmware.

By the way, I added the following Apps to my new Fire in addition to what came preloaded:

1. Netflix
2. Springboard (note taker)
3. Office Calculator (Free)
4. Chess program (AI Factory)
5. Badass Battery Manager
6. Tune In Radio
7. Tecarta Bible
8. The Weather Channel
9. 2 ebooks

I also added 1 Gb of my favorite MP3 songs. After all of that the following are my disk statistics:

Application storage = 0.94 Gb of 1.17 Gb available
Internal storage = 4.13 Gb of 5.36 Gb available

Badass Battery Monitor shows my main battery uses as follows:

TuneIn Radio Pro = 28.67%
Amazon Kindle (ebook reading) = 27.54%
Kindle System = 10.47%
Screen = 14.99%
WiFi = 13.61%

All the rest make up very small percentages, each.

TuneIn Radio appears to be consuming power all the time even when not being used.

I've had the unit active since my last recharge for one hour and 50 minutes so far and TuneIn Radio has been awake 40 minutes even though I use it rarely. I notice I left it open to one station. I'll try moving it back to it's main menu and see if it still stays active.

It may require a Shut Down move right after use to turn it off completely and then a re-awakening of the Fire.

It appears at this moment in time that my total battery life is 6.3 hours of which only 4.5 to 5.4 hours will be useable since I must recharge when it drops to 15% of it's life and possibly as high as 30% of it's life.