Quote:
Originally Posted by knc1
From GM's description, it could be almost anything on the storage side of the board recovered from a dead Kindle battery.
Say for instance, two, 2.7 volt rated capacitors in series (rated maximum voltage 5.4 volts) that never get charged beyond 4.2 volts by the Kindle's battery management.
Any pair of the ones described in the attachment would be interesting to try. 
1,000,000 charge-discharge cycles (many more when not charged to the limit) -
minimum 10 year life (probably more in this sort of application - since the Kindle battery management will not completely charge or discharge the capacitor pair).
Take off from Kindle - put on external charger - recharge them in under 20 seconds.
A capacitor diameter of 60mm is going to make a noticeable lump in the zipper case.
An interesting experiment - someone give it a try and write it up. |
I tried a large electrolytic capacitor (tiny by supercap standards). It needed a precharge for the kindle to see the "battery" (so the amber charging LED lights). USB does not supply sufficient power, so the cap discharges and the LED turns off a few seconds after the capacitor is attached and it begins to boot. I have not connected to the TTL serial port yet, but I suspect it should emit at least some info before the cap goes dead. Lots of farads are essential for a supercapacitor LiPo replacement. I have been following Robert Murray-Smith's youtube vids for quite some time. Great stuff, and super fascinating for geeks like me (and you and Jane).