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Rockbox mail archiveSubject: Re: AW: AW: AW: Bug: Battery Charging with low voltageRe: AW: AW: AW: Bug: Battery Charging with low voltage
From: Linus Nielsen Feltzing <linus_at_haxx.se>
Date: Thu, 03 Feb 2005 20:42:29 +0100 Matthias Klumpp wrote: > During the day I tried with Archos SW flashed and your SW loaded from HDD. > The JB did not hang up, but after 4h 12min the "Battery Charging" Pop-Up > came. This is because of the voltage "dips" when the battery is low, combined with a bad grounding. The button driver thinks that OFF is pushed, because the port pin for the OFF key shows a 0. > The (flashed) FW was then possibly stopping and returned to the browse > screen. Yeah, the OFF key problem again. > That way it was continuing chargeing, so I found it in this state (I was > never seeing exactly the time it went to the browser). > What do you think ? Well, the batteries are obviously not charged enough. Or they are worn out. I guess your usage pattern, where you charge them with a very low voltage for only 30 minutes at a time, isn't very good for the batteries. > I'll charge now again with Archos FW and I'll repeat that test to verify the > 4h once again. 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. > Pointing out the test conditions, so I don't have to comment that in every > mail from now on. > All tests are done with these conditions (always the same): > - Fully charging batteries with Archos FW flashed until it shows "Charging > completed". I believe that the Archos algorithm isn't very sophisticated, so it doesn't properly determine that the batteries are really full. > I then found out, that 9V and Archos FW works 100%. > So I thought it can't be a "principle" problem, but it must be a SW problem. > If Archos is able to do so, Rockbox also could be able (ok - charging > philosophie might be different). Yes, the Archos algorithm seems a lot simpler. > Just to point that out once again: > My intention is NOT to get batteries FULLY charged in the car. > I only would like to have at least a condition, that keeps my JB alive for > long time while being connected to the charger. I see. > I'm using 2000mAh batteries. > Do you think it's worth to repeat the test of your SW with some lower > capacity batteries ? Nope. That won't help, unless the 2000mAh batteries are bad. > 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. > - same way you calculated, the FW could estimate the current and that way > the total charging time (aproximatly) > - you then set the timeout (when charging stops) to that value Sure. > For sure this is not the best way to charge batteries and probably it is > able to kill the batteries, therefore it's called "aggressive" ;-))) Well, charging with a too low voltage for a long time is not what I call aggressive. :-) > As increasing the charger voltage will not solve my problem (as m.a.), any > ideas what could be done ? Not really, other than starting the charging immediately instead of waiting for a stable battery voltage reading. Linus _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2005-02-03 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |