|
Rockbox mail archiveSubject: Re: BATTERY-FAQ and the FMRe: BATTERY-FAQ and the FM
From: Neon John <johngd_at_bellsouth.net>
Date: Wed, 04 Jun 2003 20:40:33 -0400 On Wed, 4 Jun 2003 16:15:07 -0700, Vincent Kujala <kujala_at_geog.ubc.ca> wrote: >Yeah, I can remove my JBR FM20 battery quite easily. I'm >sure it won't be long before some enterprising individual >offers replacement batteries if Archos won't. > >My battery is labeled 1100mAh 4.2V - it has a thin foil >wrap holding two individual cells together (in parallel). >I customized my copy of CVS code to default 1100mAh (can't >down scroll from CVS-030530 default 1500mAh). Hmmm, I wonder if this is where the battery life discrepancy is coming from. Mine is labeled 2200 mah (I mistakenly said 2500 earlier), 4.2 volt. Here is a quickie snapshot of the unit: http://bellsouthpwp.net/j/o/johngd/files/misc/FM_battery.jpg Does this one look like yours? I've had my unit about a month. It has the blue bumpers. Mine is two 1100 mah batteries taped or heat shrunk together. I've seen this style battery in battery catalogs. I don't see any reason why they'd need to be taped together. Just drop two down in the unit and go. My unit gets only a bit warm during charging. When the charge is complete the unit returns to almost room temperature. I have the display set to stay on when plugged into shore power so I assume that's the source of the tiny bit of heat. The Li batteries should NOT remain hot after charging is complete. One other thing regarding power. Last night I changed my battery/carry bag around from the Rio Volt to suit this unit. This is a small camera bag in which I carry all my accessories, including a small set of unamplified speakers. It also contains a pair of 4 ah, 6 volt gell cells (available from Lowe's, Home depot, etc for emergency EXIT lights) connected to a power cord. I formerly had them in series with a 9 volt regulator for the Volt but now I have them in parallel. Lowe's has an 8 ah 6 volt battery which would be more convenient for this application. With the Volt I simply played the unit whenever it was convenient to have it in the bag, such as a weekend camping trip. I'm still experimenting with the FM recorder to determine what the best use of the battery is. I THINK it will be to allow it to charge the internal battery, then disconnect. This is a VERY nice setup, allowing me to listen continuously for a whole weekend without external power (at least I could with the Volt - we'll see with the FM), handy for long camping trips. John > >I typically get 6-8 hours playback time, slightly less than >4 hours recording time. If I leave it plugged in overnight >it tends to heat up near the power connection - I've installed >an AC timer to switch on/off at 1 hour on, 1 hour off for long >overnight recording sessions. I'm concerned that overcharging >might fatique some of the power regulation circuitry if not the >battery (pure speculation here). I'm trusting the Lithium Ion >battery will stand up to this charge/discharge cycle - otherwise >I'll be shopping around for a new battery before too long. > >As for replacing the hard drive, muchas gracious to the list >for earlier discussions ("quiet drives"). I know I have to >unsolder the tin cover plate to extract the drive - warrantee >violation I'm sure, whatever. If you can't handle a soldering >iron and/or you're squimish about warrantees don't bother. >I nearly blew something up when I forgot to remove the battery >and my iron slipped onto a capacitor (spark!) - I'll know >better next time. > >I do my bit to advertise RockBox, all my friends know how >cool I think this project is. They might even think about >buying an Archos if/when they buy a recorder/player. --- John De Armond johngdDONTYOUDARE_at_bellsouth.net http://bellsouthpwp.net/j/o/johngd/ Cleveland, Occupied TNReceived on 2003-06-05 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |