How do I fix a Kindle Fire whose battery runs low too often.

Hello

"Performing a hard reset on your Kindle Fire may resolve intermittent issues like a frozen screen, battery issues or trouble downloading content to your Kindle Fire. Allow your Kindle Fire to charge for approximately 30 minutes, then try the following steps.
To perform a hard reset on your Kindle Fire, press and hold the power button for 20 seconds and then release. After the device has completely turned off, press the power button to restart your Kindle Fire.
If your Kindle Fire is still unresponsive, try charging your Kindle Fire before trying to reset the device again. Hope this helps, good luck.

For more query visit us: Kindle Fire Support

I need to update it Cindy, Normally you just go to the kindle store and down load your updates for specified model. Attached links will explain how to update your Kindle and what update you may need.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Amazon Now Demanding That You Update Your Very Old Kindle The Digital...
Amazon update your old Kindles or youll be cut off from the store

How To Manually Update Your Kindle Fire Firmware Software

Step by Step Directions for Updating Your Kindle Fire Tablet

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There is alot cases for kindle

Step 1 - Back Case

• Wedge a plastic opening tool into the lower right corner of the Kindle Fire.
• Pry the case apart and run the plastic opening tool along the perimeter of the Kindle Fire to release the clips securing the case halves to each other.
• If you are having extreme difficulty inserting the plastic opening tool, carefully use a metal spudger to undo the first clip, then switch back to the opening tool to avoid scratching your case.
  • It is helpful to pry the bottom of the Kindle Fire away (and out from the side) from the top part. Exerting too much force attempting to split the two without pulling away can cause the tabs on the inside to crack.

Step 2

• Once you have freed all the plastic clips, pull the back case off the Kindle Fire.

Step 3 - Battery

• Fit the tip of the plastic opening tool between the right battery cell and the Kindle Fire's frame.
• Lever the battery up and work the plastic opening tool down along its edge to release the glue securing it to the frame.
• step 4

• Repeat the process from the previous step to free the left battery cell.

Step 5

• Lift the back of the battery up to relieve any tension in the battery connector and simultaneously use a spudger to push the battery connector out of its socket.
• Pull the battery out of the Kindle Fire.

Kindle Fire Battery Replacement

You will need a New battery, and electronic contact cleaner, or more and like a new Kindle ?
Sorry

If I understand you correctly, you have a new Kindle Fire HD and would like to transfer the data from your old Kindle Fire to your new Kindle Fire HD. This is easy, follow these steps:
Step 1: Connect the old Kindle to Wireless. Pull down the upper status bar, select More + and then select My Account on the old Kindle
Step 2: Using the Old Kindle, select Deregister under My Account, let the task complete
Step 3: When the old Kindle has Deregistered, then pickup the new Kindle. If you accidentally registered this Kindle Deregister it and then Factory Reset the device.
Step 4: Now the old Kindle is Deregistered and the new Kindle is factory Fresh, let's begin the process.
Step 5: On the new Kindle, let's reboot after Factory Resetting the device. When the device powers back up you should be presented with a login Window. Go ahead and register the device to the same account as the Old Kindle. The sync process should begin automaticlly, it can take up to one full day to sync all your content.

This is usually a sign of either a failing charger or Kindle, let's try to hard reset the Kindle.
Step 1: Press and hold the power button for 60 seconds
Step 2: Plug the Kindle into the changer, press and hold the power for 30 seconds
Step 3: Let charge for 12 hours
Step 4: Turn on and use the Kindle, if it shuts down before 6 to 8 hours of use, contact Amazon for a replacement.

It is possible that your Kindle Fire's battery has died. If you noticed the battery life diminishing before it wouldn't turn on at all this may be the case. Here is a site that has replacement batteries for the Kindle Fire:
3555A2L Battery for Amazon Kindle Fire D01400

You may need a new power cord or it is possible that your Kindle Fire's battery has died. If you noticed the battery life diminishing before it wouldn't charge this may be the case. Here is a site that has replacement batteries for the Kindle Fire:
3555A2L Battery for Amazon Kindle Fire D01400