Quote:
Originally Posted by rcentros
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So, I guess, even though the old Kindle battery showed 4.22 volts, its amperage must not have been up to snuff.
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Close.
A ?feature? of Li-Ion is that it can show a full charge terminal voltage and have hardly any more
storage capacity than a run-down hearing aid battery.
Any discharge rate (amperage) can cause it to go from 'full' to 'empty'.
Even just writing to the eMMC (and if it hits bottom before the eMMC completes its internal cycle, the eMMC is dead).
Amazon/Lab126 made a similar mistake in the early firmware designs - they allowed/postponed things based on "terminal voltage" rather than on "storage capacity".
The "5 series" firmware is fixed for that problem, and maybe the "4 series" also.
A bit of trivia:
The transmitter of the 3G module pulls 4 amps when actively transmitting.
(3G is a burst mode protocol - mostly the transmitter is off - but that is 4 amps during the burst.)