[sirmaru]

Amazon placed the recharge indicator at 15% for the Kindle Fire. They have issued no other instructions to contradict it. Thus, I do a full charge at between 10% and 20%. By the way, Amazon sells replacement Lithium batteries for the Kindle 1. They do NOT sell replacement batteries for the Kindle Fire. There must be some reason for their different approaches to the two devices.

The Kindle 3rd Gen Keyboard also has recharge indicator. I only charge that one when the recharge indicator beeps. I see no reason to recharge it earlier. I purchased that one in December, 2009. Its probably living on borrowed time now.

I purchased a Sony PRS 500 in December, 2007. I gave it away in 2009. I purchased a Sony PRS 900 in December, 2009. I still own it but it has sat unused for over a year now. That battery still works and I haven't charged it for a year. I leave it in shut down mode.

My new ATT cordless phones (DECT 6.0) has a manual saying to always leave the phones in the chargers at full strength. Thus, I do that with those phones.

My NowBible instruction booklet says the device will fail after 500 charges. I let that device run its battery to zero before a full charge. Its lasted 18 months without any battery problems so far using that doctrine. I'm in the 25th charge cycle with that device. I fully expect it to die when I get to cycle 500. I hope a new generation of that device occurs before then.

The Lithium Manufacturer instructions I linked earlier in the thread indicated ALL Lithium batteries die after 300 to 500 charges and, if full charges are not used, they die within 2 to 3 years in any event. That would indicate daily full charges will end the battery life in 2 years.

I still say, do anything you want it won't matter. Our appetites WILL force all of us to buy a new eReader probably by the end of 2012. Maybe it will not even be called a "tablet." It may be called a "DualScreen." So far I've spent far more money on eReaders than on eBooks and its only the "toy" value of the eReaders which has caused this. If I didn't appreciate the "toy" value, I'd still be reading print books.