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These help with a lot of questions we have asked a lot. The answers have been varied, but here's something fairly official and I'm moving it from the bottom of another post where it would be read with glazed eyes from what came before it. Bolding is mine.
=====================================================
FROM CUSTOMER SERVICE SECTION OF AMAZON FORUM FOR KINDLE2
http://tinyurl.com/kindle-2-forum
" Posted on Mar 2, 2009 6:01 PM PST
Amazon Kindle Customer Service says:
Good Evening. This is the Official Amazon.com Customer Service post for 3/02/2009
Charging your Kindle battery
With Kindle 2's battery you don't need to fully drain the battery before recharging, or wait until the battery is fully charged to start using it again. The Lithium-ion battery is optimized in such a way that incomplete charging won't affect the battery life. For example, if you drain the battery halfway two days in a row while fully charging both times at night, this would only count as one charge cycle. Leaving Kindle in extreme temperatures, like in your car, will have the most negative impact on the overall life of your battery.
Leaving wireless turned on or sustained use of the wireless functions will cause the battery to drain faster. If you would like to turn the wireless off, select menu from the home screen. Use the five-way controller to select "Wireless Off". Also, downloading a large number of books at once will cause the device to index new content. If you have recently transferred or downloaded a large number of books it is recommended that you leave the device turned on and connected to the charger overnight.
As with any other aspect of Kindle, if you think that your device is not performing as it should, please have detailed notes of your usage and the battery life experienced and contact customer support:
https://www.amazon.com/gp/help/contact-us/kindle-help.html
=======
OTHER ***VERY INTERESTING*** things from Customer Service's official Thread in Kindle 2 forum
http://tinyurl.com/kindle-2-forum
3/4/2009 posting:
"Last Page Read
You do not need to power down Kindle 2 between reading sessions, it is best to leave the device in sleep mode. Holding the switch at the top to power the device off is similar to pulling the power cord on your computer without shutting down the Operating System. If you turn the device off while in the middle of the book, the device cannot save that location. We save the location when the device goes into sleep mode or when you leave the book, so if you do need to power the device off then be sure to go to the Home screen first - this will save your last place in the book.
Wireless Signal in Sleep Mode
Kindle's wireless signal uses low power while in sleep mode so that your subscriptions can download overnight. If you are in a low coverage area, this could cause the device to use more battery power as it continually tries to maintain a signal. Unless you are subscribed to periodicals that you want to receive overnight, we recommend turning wireless off (Press the Menu button and select "Turn Wireless Off" of the menu options) before leaving the device in sleep mode. This will further conserve battery power.
================================================================
I think Amazon may be worried about the effects of letting it run down and not
being able to control how much this might be done. Users let them run down without
even knowing it.
WORSE, mine defaulted to Wireless ON when I opened my unit. That means that
if I didn't know how to turn it Off because I had not read the manual yet, it would
be draining away and that seems to be true for many on the forums who are
wondering why their battery life is so short and wondering where to turn wireless off
=====================================================
FROM CUSTOMER SERVICE SECTION OF AMAZON FORUM FOR KINDLE2
http://tinyurl.com/kindle-2-forum
" Posted on Mar 2, 2009 6:01 PM PST
Amazon Kindle Customer Service says:
Good Evening. This is the Official Amazon.com Customer Service post for 3/02/2009
Charging your Kindle battery
With Kindle 2's battery you don't need to fully drain the battery before recharging, or wait until the battery is fully charged to start using it again. The Lithium-ion battery is optimized in such a way that incomplete charging won't affect the battery life. For example, if you drain the battery halfway two days in a row while fully charging both times at night, this would only count as one charge cycle. Leaving Kindle in extreme temperatures, like in your car, will have the most negative impact on the overall life of your battery.
Leaving wireless turned on or sustained use of the wireless functions will cause the battery to drain faster. If you would like to turn the wireless off, select menu from the home screen. Use the five-way controller to select "Wireless Off". Also, downloading a large number of books at once will cause the device to index new content. If you have recently transferred or downloaded a large number of books it is recommended that you leave the device turned on and connected to the charger overnight.
As with any other aspect of Kindle, if you think that your device is not performing as it should, please have detailed notes of your usage and the battery life experienced and contact customer support:
https://www.amazon.com/gp/help/contact-us/kindle-help.html
=======
OTHER ***VERY INTERESTING*** things from Customer Service's official Thread in Kindle 2 forum
http://tinyurl.com/kindle-2-forum
3/4/2009 posting:
"Last Page Read
You do not need to power down Kindle 2 between reading sessions, it is best to leave the device in sleep mode. Holding the switch at the top to power the device off is similar to pulling the power cord on your computer without shutting down the Operating System. If you turn the device off while in the middle of the book, the device cannot save that location. We save the location when the device goes into sleep mode or when you leave the book, so if you do need to power the device off then be sure to go to the Home screen first - this will save your last place in the book.
Wireless Signal in Sleep Mode
Kindle's wireless signal uses low power while in sleep mode so that your subscriptions can download overnight. If you are in a low coverage area, this could cause the device to use more battery power as it continually tries to maintain a signal. Unless you are subscribed to periodicals that you want to receive overnight, we recommend turning wireless off (Press the Menu button and select "Turn Wireless Off" of the menu options) before leaving the device in sleep mode. This will further conserve battery power.
================================================================
I think Amazon may be worried about the effects of letting it run down and not
being able to control how much this might be done. Users let them run down without
even knowing it.
WORSE, mine defaulted to Wireless ON when I opened my unit. That means that
if I didn't know how to turn it Off because I had not read the manual yet, it would
be draining away and that seems to be true for many on the forums who are
wondering why their battery life is so short and wondering where to turn wireless off