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| Portable Source Gear Discussion of portable audio source gear, like iPods, other digital audio players (DAPs), MD players, portable CD players. |
04-12-2008, 09:11 PM
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Headphoneus Supremus
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Join Date: Sep 2005
Location: Hampshire, England
Posts: 3,564
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Quote:
Originally Posted by athenaesword
so the usb2.0 runs at a higher voltage than what the Li+ battery is supposed to charge at.. issit not advisable then to charge via usb but use a 4.2V ac charger? or will it charge at 4.2V all the same.
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Reply to olden question, but relevant.
Batteries will just suck what they need. Current is involved too, but that muddies the waters and you don't need to know...
__________________
Sources:foobar w/FLAC[Vista64/WASAPI] > Juli@ > Optical > Headroom MicroDAC/Headroom MicroAmp
Portable Sources:32GB Cowon S9, 16GB Cowon D2+ w/32GB Verbatim Class 6 SDHC
Headphones:Sennheiser HD 650[Cardas], Sennheiser HD 595/50Ω, Audio-Technica ATH-ESW9, Audio-Technica ATH-A900, Koss KSC-75
Last.fm
I'm disabled, so expect a few typos.
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06-01-2008, 02:28 AM
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Head-Fi'er
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Join Date: Nov 2003
Posts: 86
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Quote:
Originally Posted by Chri5peed
I knew most of that being an electrician, but certainly very handy. Proper care for my Zen Touch battery has meant its kept its capacity for nearly a year, it nearly lasted all the time I was away on vacation last week, well over 20 hours.
Also its important to know that Li-Ion batteries charge at 4.2Volts per cell and USB2 ports run at 5Volts. So in fact DAPs which charge through the USB port are getting the same level of charge as using the mains.
Also, I didn't know, but USB2 ports stay energised as long as your PC is plugged in, but it doesn't need to be turned on. Li-Ion batteries can't be overcharged so its okay to leave your DAP connected to the USB constantly.
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i think they can be over charged, its just that the controller will just stop it from happening.
just keep the thing relatively full and it'll be fine. mp3 players are so low drain they are pretty gentle on their batteries.
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06-11-2008, 11:39 PM
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Junior Head-Fi'er
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Join Date: Jun 2008
Location: South shields, England
Posts: 2
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Hi.
First post.
If anybody's interested 3.85 volts equates to 40% charge in a li-ion cell.
A number of different player will show you the battery voltage in the service menu.
Regards
John.
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06-13-2008, 03:09 AM
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100+ Head-Fi'er
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Join Date: Oct 2006
Location: Edmonton, AB
Posts: 111
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i had no idea.....thanks for the useful info!
__________________
team girl-fi | team university-fi | feedback
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07-14-2008, 04:04 PM
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Junior Head-Fi'er
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Join Date: May 2006
Posts: 24
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Quote:
Originally Posted by acp6s
be sure not to recharge when relatively full, best way is to drain then recharge then
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Not for any Li-Ion chemistry battery. They are best charged early and charged often.
NiMH should be discharged completely occasionally, but isn't needed every time.
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08-05-2008, 08:33 AM
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Junior Head-Fi'er
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Join Date: Aug 2008
Posts: 8
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good info, thanks 
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10-31-2008, 06:04 AM
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100+ Head-Fi'er
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Join Date: May 2008
Location: Las Islas Filipinas
Posts: 300
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simple don't recharge it when its not completely drained
__________________
Cans: CAL!, Creative EP-830, Koss KSC-75 (retired)
Sources: iPod Classic 6G 80GB, Realtek ALC662
Amps: Fiio E5
I quit head-fi.. Too many nerds, too little music afficionados.
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11-13-2008, 05:21 PM
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Head-Fi'er
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Join Date: Jan 2008
Location: NY / Ontario
Posts: 59
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interesting read... thanks for the links
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11-18-2008, 11:13 PM
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Junior Head-Fi'er
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Join Date: Oct 2008
Posts: 22
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good read, thanks.
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11-24-2008, 08:28 AM
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500+ Head-Fi'er
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Join Date: Jun 2008
Posts: 627
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Quote:
Originally Posted by noahlapuz
simple don't recharge it when its not completely drained
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wrong.
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02-12-2009, 04:11 AM
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Junior Head-Fi'er
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Join Date: Dec 2008
Posts: 21
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I think the most impt step is always to charge superlong on the first charge right? I always charge like 10 hours for the very first charge even if it shows that the batt is full. I also heard that once in a while you shld fully drain the battery and recharge again.
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08-07-2009, 02:53 PM
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100+ Head-Fi'er
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Join Date: Jul 2009
Posts: 153
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Quote:
Originally Posted by austonia
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Thank for the link, I am going to check to it for I am facing the charging problem with one DAP.
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08-22-2009, 03:58 PM
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Junior Head-Fi'er
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Join Date: Aug 2009
Posts: 15
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Very informative links, i have read them completely and got some good inputs to improve the battery life. Thankyou for the links, if I misuse or abuse my battery, the most it's going to cost is £25 for a replacement a couple of months down the line. Thanks
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