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Rockbox mail archiveSubject: Re: External battery pack options for FMRRe: External battery pack options for FMR
From: Mike Holden <rockbox_at_mikeholden.uklinux.net>
Date: Tue, 12 Aug 2003 16:03:53 +0100 (BST) Todd Lowe said: > >> No idea about the battery pack, but if it provides similar power input >> to the wall-wart, it should be ok. I doubt it would do any harm, so >> long as the volts and amps delivered are similar yo the power unit >> supplied by Archos. > > The battery pack supplies 6V, which is the same as the voltage from the > AC adapter used for normal charging. I assume since it is intended for > digital cameras, it shouldn't have voltage fluxuations much above it's > listed voltage. It's not just the Volts that matter, but the Amps as well. >> I will say that 2-2.5 hours sounds very poor performance however. I >> certainly get a lot longer out of mine. How do you charge the unit? Do >> you remove the power as soon as the charge shows 100% in Rockbox? If >> so, leave it overnight, as Rockbox currently shows 100% long before >> the charger stops charging because the battery is full. > > Yes, it is poor performance. I charge the unit all night -- I have > looked at the battery charge from the DEBUG screen, and it is the same > as quoted by others (~4.25V when plugged into AC adapter at full charge, > ~3.87V immediately after unplugged). I do suspect that the 180Kbps VBR > files cause it to eat up the battery faster than the "average" user, but > I'm not willing to downsample -- I have ~9000 high quality MP3s which I > play on my car stereo and on my home stereo, and I don't want them to > sound like 128Kbps crap (which sounds like "underwater" music to me on > decent speakers). Just to be sure it is fully charged, have a look at the Debug -> View IO Ports screen, at the AN7 value. This should be around zero when the charger is unplugged, and will go to a higher value when the charger is plugged in. If the charger is actively charging the battery, the value will be quite high, slowly dropping to a value of around 0C0 or less as the battery gains charge. If the value is higher than 0C0, then the battery is not fully charged yet. -- Mike Holden Rockbox page: http://www.mikeholden.org/~rockboxReceived on 2003-08-12 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |