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Rockbox mail archiveSubject: Re: External battery pack options for FMRRe: External battery pack options for FMR
From: Todd Lowe <tmjlowe_at_email.com>
Date: Wed, 13 Aug 2003 02:52:10 -0700 (PDT) > > 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. > > > > I agree. I listen to 200ish VBR and 256 CBR all the time on my player, > and I generally get 6-10 hours with 1800 MAh NiMH's. I understand the FRM > should have similar run-times. > I ran an experiment today with interesting results -- previously, I had always gauged battery life from use on-the-go. Today, I started with a fully charged battery, set it on my desk, and let it play undisturbed. It ran for 4.5 hours, and still had 3.2V on the battery. I moved it to another room, and when I plugged it into my stero connector, it went dead. I tried to reboot it again, twice, but it didn't seem to have enough juice to boot. I figured the batteries finally were spent. (BTW, I have already applied the Rockbox flash to the rom, it works great, no probs w/ quick boot). THEN, I plugged it back into the AC charger just long enough to get it to boot (< 1 minute) and I unplugged the AC charger cord. The unit then continued to run for 5+ additional hours, again, undisturbed, and was only down to 2.8V when I had to leave. So, I'm beginning to think it might be a loose battery lead inside -- when I handled it to move it between rooms (and when I'm on the go), it must lose its connection and die early ??? (i.e. at between 2-3 hours). My conclusion is that the LiIon battery is not really that bad, its simply a construction Q/C problem. BTW, I have seen instructions on the web for taking the FMR completely apart, resoldering connections, etc., to fix this kind of trouble but I've never soldered anything, and I don't want to practice on my FMR. Not to mention never getting the battery cover to stay on properly again... > Do you have sane setting on things that eat batteries, such as backlight > timeout and the like? Yeah, the backlight is only on for 3 sec, and my file directory limit is 800 files (does this make a huge diff in the memory used for the song buffer?) Anyone that is tracking battery voltage change stats, I'd be glad to pass on data from my FMR. thanks, Todd Received on 2003-08-13 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |