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Subject: AW: AW: AW: AW: Bug: Battery Charging with low voltage

AW: AW: AW: AW: Bug: Battery Charging with low voltage

From: Matthias Klumpp <>
Date: Fri, 4 Feb 2005 19:58:52 +0100

Hi Linus,

1st (as usual) the test results of today:
- your SW NOT flashed
- started 8:33
- got stuck 14:00
- this time I didn't need to disconnect/re-connect the charger
- it was sufficient to start playing again
- at 16:23 batteries were low (no boot anymore)

So (unfortunately) for my situation, it seems that the done fix is not
changing the situation.

Following some comments acc. to you last mail.

# -----Ursprungliche Nachricht-----
# Von:
# []Im Auftrag von Linus Nielsen
# Feltzing
# Gesendet: Donnerstag, 3. Februar 2005 20:42
# An: Rockbox development
# Betreff: Re: AW: AW: AW: Bug: Battery Charging with low voltage
# This is because of the voltage "dips" when the battery is
# low, combined with a bad grounding. The button driver thinks that OFF is
# because the port pin for the OFF key shows a 0.

I guess I finally understood the "GND problem" ;-))
You were not talking about a permanent ground problem, but only about some
short "dips".
Ok, that might be.
That also means, possibly any "shock" on the table (where the JB is) could
have been caused such a dip.
Isn't there any input filter to filter out such "peaks & dips" ;-)) ?

# > The (flashed) FW was then possibly stopping and returned
# > to the browse screen.
# Yeah, the OFF key problem again.

Ok, it is getting clearer :-O)

# If you only get 4h play time from your 2000mAh batteries,
# even with the Archos charging, something must be wrong, either with your
# batteries or your jukebox hardware.

You are frighting me ;-o?

# I believe that the Archos algorithm isn't very sophisticated, so it
# doesn't properly determine that the batteries are really full.

Maybe, but at least it is the same starting condition for every test I do.

# > Wouldn't it be a possible way (or better workaround) to
# implement something
# > like a "aggressive charging mode", user configurable in
# the settings:
# > - start charging immediately after the charger is detected
# Absolutely.
# > - we already have the bat. capacity in the settings
# > - there could be a 2nd parameter where the user specifies
# the charging
# > voltage (don't know if RB can get it from ADC)
# I have some ideas about finding out the charging voltage,
# but the best might be to have a setting for it.

Will you follow to find a SW fix for that ?

THX a lot


Received on 2005-02-04

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