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Batteries & USB Devices & Charging

I see lots of people have trouble with their batteries for their various USB connected devices. Unfortunately you cannot usually charge a totally flat battery, or even a 1/2 charged one... from the USB port. These are only used to "Top Up" the battery... & keep it charged up via a "Trickle Charge". at very low current.If your battery is in this condition then you need to replace it with a fully charged one, and then use the USB to keep it fully charged.Another way is to connect the "Flat" battery up to a power supply or machine that charges them, at the right Voltage (Usually 3 - 6 V) & Current rating, and once fully charged, then use the USB.

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I have been trying to recharge the unit as I typically do by connecting it to my compu but the battery is still low. I read in the manual that this unit might need a new battery, if so, where can I buy one?


You could try say Ebay... or the like.
You cannot usually charge a totally flat, or even a half flat battery from the USB port. These are on;y used to "Top UP" the battery... You need to replace it with a fully charged one,and then us the USB to keep it fully charged.

Jan 29, 2010 | RCA OPAL M4001 MP3 Player

1 Answer

the phone has been dead for more than a year


You cannot usually charge a totally flat battery from the USB port. These are only used to "Top UP" the battery... You need to replace it with a fully charged one,and then us the USB to keep it fully charged.

Jan 29, 2010 | Sony Cyber-shot DSC-T20 Digital Camera

1 Answer

Can not turn on! my garmin nuvi 200w I think it is locked,


if ther battery went totally flat place it on charge for an hour or so to revive it. Max battery life in storage is 4 days with a good battery.

Charging it even tho the charge light may not show should build up enough charge to eventually show the light and allow you to turn it on. It should remain on charge for 5hrs.

Other possibility is a collapsed cell in battery, replace the battery

Jul 24, 2009 | Garmin nuvi 250 GPS Receiver

1 Answer

my sony walkman mp3 will not play on a dock


I had the same problem! Went on Sony trouble shooter found this -
Cause:
Battery is 100% discharged. Therefore, PC's USB with 5V/500mA set up has not enough power to start up the charging process because loading current is greater than the set up, therefore USB is disabled immediately due to sudden current load.
Remedy:
  1. Battery must not be discharged 100%
  2. If it happens then the supplied AC adaptor must be used firstly because it is providing 5V/800mA power. After a couple of minutes the unit can be connected to PC without problem then it can continue the charging during file transfer, etc.
Basically when the battery is totally flat the computer power is not strong enough to charge the battery and run the mp3 player! I bought a usb adapter charger and charged it up and now it works!
HOPE IT WORKS FOR YOU!

Mar 29, 2009 | Sony Network Walkman NW-E005 MP3 Player

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