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Old 11-09-2017, 11:47 AM   #1111
knc1
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Quote:
Originally Posted by greenalien View Post
Battery terminal voltage isn't the same as charge voltage, which always needs to be a bit higher than final voltage. Kindle chargers output 5V.
And they do not connect directly to the battery.

The way you worded your post, it read as if you had connected your bench supply directly to the battery.

And 4.2 volts IS the over-terminal capacity charge level.
Normal, that is, not including the over-charge level, is 3.7 volts.

But since you need a new battery anyway - have fun, you can not make this one any worse regardless of how you mistreat it.
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Old 11-09-2017, 01:18 PM   #1112
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OK, so after 3 hours, the battery voltage has gone up to 4.07V, which is getting close to fully charged. At least that works, no need to source a spare battery.
Unfortunately, having reinstalled it in my Kindle and retried Kubrick, no luck. Each step only takes a few seconds before the green bar appears, which is much too fast.
I suspect that it either never gets into downloader mode, or doesn't stay in it for long enough for anything to complete.
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Old 11-10-2017, 06:44 AM   #1113
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Quote:
The way you worded your post, it read as if you had connected your bench supply directly to the battery.
Of course I connected the charger directly to the battery. I chose to use a 5V charge voltage, but it could easily have been 6V or even 10V if used for short bursts - the critical voltage is the voltage that the battery pack has charged up to, not the charging voltage (which must always be larger than the critical voltage, or the battery would never get up to its critical voltage!)

We are not talking about a float charge here, which would be at the same level as the rated voltage, i.e. 3.7V.

The 2 essential criteria are charge current and the battery's state of charge - as you say, this must not exceed 4.2 volts, and must be checked regularly by disconnecting the charger and using a voltmeter directly on the terminals, a process that is automated in a smart charger.

One would normally charge at around 10% of the batteries current rating but it's possible to push Lithium batteries a bit harder, provided that you continuously monitor the battery temperature.

Last edited by greenalien; 11-10-2017 at 06:47 AM.
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Old 11-11-2017, 01:18 PM   #1114
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Quote:
Originally Posted by ixtab View Post

EDIT: This post is obsolete. The problem was caused by testing inside a Virtual Machine instead of on real hardware (see below). It's kept for reference.



There's nothing you can do to make it progress, because this situation is not expected to happen, so the program just waits indefinitely. When booting a device into fastboot mode, it is expected to end up there

But you can do something to help out, namely:
- reproduce the situation. You can just reboot the LiveCD, and perform the same steps again, and you should be getting into the same situation.
- switch to the second console (Press ALT+F2), then login there.
- enter "lsusb", and press ENTER
- post its output here. What's really important is the parts after the "ID" entries, so if you're "manually copying" stuff, you can ignore the Bus and Device output.

When entering fastboot mode, a device with ID 1949:d0d0 is expected to show up, but maybe that is different on your Kindle. Please post the lsusb output.
Hello everibody !!
I'm trying to debrick my K4 with kubrick but I stuck at "putting your device into fastboot mode".
I switched to second console and my device ID is:
15a2:0052 Freescale Semiconductor, Inc.
Need I to trash it ?
Thanks
Stil86

Last edited by stil86; 11-17-2017 at 01:44 PM.
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