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I have a Garmin GPS unit which has discharged to zero percent many times and the battery still works fine after 2 years.
This death of a Kindle Fire simply had a bad battery from the get go.
However, just to be sure I'm charging all my units of all types now with Lithium batteries if they go under 30%.
Since I had read that 500 charges are the limit of all Lithium batteries then too frequent charging will reduce the time the battery lasts.
Since Amazon has their charge warning at 15%, I'm sure that is sufficient as well. Charging between 15% and 30% is probably the correct balance.
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