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The Amazon "wall charger" is not a "charger" in the sense you are reading about them. They are only a source of 5 volt dc.
You will not be connecting the "charger" to the battery, you will be connecting it to the USB connection on the Kindle.
Inside, between the dc power and the battery is a fairly sophisticated power management circuit.
"fairly" does not fully deal with the things that can happen to a Li-po battery.
Which is the reason behind the low level temperature use - it "tweaks" the battery management system to correctly charge an over-discharged battery.
PS: The RC model world and the original RC drones once upon a time used "bare" Li-po batteries.
Thus the warning you have read about.
At least in the USA, all Li-po batteries sold in this country have included at least minimal battery management built in.
The Kindle has such controlled batteries PLUS the Freescale power management system (which you are tweaking).
Relax. Your ice cream will not be blown up by the Kindle.
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