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Charging a battery depends on the battery capacity and the current you use to charge.
The best for a rechargeable battery is to charge it with 10 to 20 % of its capacity. If you choose 10%, you charge for 14 hours and 20 % you charge 7 hours.
Most chargers, charge on a higher current. (quick chargers), but just try to calculate what it takes to get 140% into the battery. That is the maximum time needed to charge.
If after that time the battery is still not "full" or at least the chargere light does not indicate it is finished charging, it could be the battery is defect.
Try taking the battery out and running it. Some models will run without the battery, some won't. If it runs it's the battery that's shot. It is often the battery that goes as they only are good for a few years. I'm assuming you get into windows with it plugged in as you're seeing that it shows "0" left charge. Batteries will also get a much shorter life as it ages.
Make sure the player is fully charged. 1. Connect the player to your computer. 2. Make sure the computer detects the player. NOTE: If needed, switch the player to MSC mode, 1. Turn device OFF. 2. Slide the Hold switch down to Lock (orange color showing). 3. Press and hold the center button while connecting the device to the PC.then connect it to the PC. Next Be sure the battery is charged 1. Leave the player connected for approximately 2 hours to charge. 2. Disconnect the player from the PC. 3. Verify if you can turn on the player. 4. Reset the player if necessary. To reset the player: 1. Press and hold the Power/Menu button for approximately 20 seconds. 2. Release the Power/Menu button. 3. Press the Power/Menu button again to turn on the player. If that does not do it, re-seat the battery: Then try and see if it will come on with out the battery hooked to your computer, which I see you have done but did you change modes MSC to MTP . next delete the song it keeps hanging on and re-copy it back on to the player from a different folder or re-rip it from the CD and copy it into a new folder then re-copy to the player.
I've had this problem a few times when I haven't used my Zen for a couple of weeks. Even when the unit is powered off it still consumes battery (as the clock continues to work in the background) - so eventually the battery completely dies.
Hook it up to your PC with the USB cable and, if you can see the battery icon and it looks like it's charging, then just leave it for about 1-2 hours (it takes this long to come back to full life - enough to be recognized by your PC, anyway.
If possible, find another USB cable that will fit the connector, as the white USB that comes with the Zen is pretty rubbish and takes forever to charge - I use the mini USB cable that came with my Sony Ericsson Xperia X1 phone and it works a lot better.
usually 8 hours is what is suggested when you get a new battery. i like to burn down the power on the battery completely till it turns the unit off, then let charge for 24 hours just to reset the battery correctly.