You need to get a usb jack. Next you need to plug it into your computer and then plug your mp3 into the other side of the cord. Leave it pluged in for about 2 hours and your mp3 will be charged and ready to go!
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Check the orange "Hold" switch on the left side of the Sansa C150, if you cannot turn on the MP3 player or if none of the buttons is working. When the "Hold" switch is up, the buttons are disabled. Slide the "Hold" switch down to activate the buttons again. 2
Press and hold the "Power" button until the LCD screen lights up when turning on the MP3 player. Pressing the button quickly does not turn on the device. The "Power" button is located on the front of the device, under all the other control buttons. 3
Replace the AAA battery, if you cannot power on your MP3 player. To replace the battery, remove the battery cover from the back of the device by pressing in on its tab and pulling it off. Remove the old battery, insert the new battery and replace the cover. One AAA battery provides approximately 15 hours of power for your Sansa C150. 4
Change the backlight settings to conserve battery life. This is useful if you find the battery loses power quickly during normal use of your Sansa C150. To change the backlight settings, choose "Settings" to bring up the "Settings" menu. Select "Display," "Backlight" and then a shorter backlight time. The backlight will shut off after a period of inactivity that matches your backlight setting. 5
Review your music purchases to understand what rights you've purchased to the content, if you are unable to play a track back on your Sansa C150. When you purchase music, it comes with certain rules for how you can store and play it. You may not have paid for the right to transfer the song to a portable media player. 6
Reset the Sansa C150 if it acts erratically or if you have other problems. To reset the device, open the "Settings" menu and choose "Reset All." Choose "Save" to finish restoring the MP3 player to its factory default settings. If you decide not to reset the device during this process, select "Cancel" instead of "Save."
Reset the device.
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.
Power cycle the device.
The power cycle discharges excess/residual power from the player; with the use of a new battery, it should be able to power on the MP3 player properly.
STEP 1 - Remove the battery
STEP 2 - Power cycle the player
1. Connect the player to the PC.
2. Leave the device connected for about 2 minutes.
STEP 3 - Turn on the device
1. Unplug the player from the PC.
2. Insert a fresh AAA battery into the player.
3. Turn on the player.
I had this same problem with a walkman a long time ago. If those batteries are connected right it could be the little metal prong they touch, that could be bent. Bend it back with a screwdriver and see if that helps. Sorry if that is lame help.
You don't need to worry about current rating, if you are using alkline batteries just replace it when it goes flat. All AAA cells are a standard physical size, if you are using rechargeable cells then get the one with the highest amp hour rating. I suggest you get nickel metal hydride battery, the highest capacity I've seen is 900 mAh rating.
Try these steps, if they aren't of any help, you may have to have the vendor replace your mp3 player.
SOLUTION 1 - Reset the device. 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.
SOLUTION 2 - Power cycle the device.
STEP 1 - Remove the battery
STEP 2 - Power cycle the player 1. Connect the device to the PC. 2. Leave the device connected for about 2 minutes.
STEP 3 - Turn on the device 1. Disconnect the player from the PC. 2. Insert a fresh AAA battery into the player. 3. Turn on the player.
Get out the battery and let the device "calm down" without any source of power for 5-10 minutes. After that push the menu/start button, hold down for 30 or more seconds and holding down, insert the battery. It has to reset the power circuitry and should help.