What is the internal battery in Sony HDR-HX9V camera that retains the date, time settings?

Hi, yes, there is a small coin memory battery, usually something like a CR3032 lithium battery. Turn off the camera and insert a new 'coin' battery (correct side up). Close battery cover, turn on camera and go to menu and set time and date. It should remember the time and date for a year or two, provided you put a regular battery on the camera on a regular basis. Also note, some older Sony cameras allow you to set it so that it shows only the date for the 1st 5 seconds when you first turn on the camera that day, then shuts it off unless you want it to superimpose the time and date on the video. Good luck, and let me know if this solves your problem. John

you need to change your settings to auto date and time update

Cyber-shot cameras nowadays have a built-in rechargeable battery for retaining time, date, and other settings. Since the built-in rechargeable battery is not removable, current Cyber-shot camera models can only be returned to the original factory settings by pressing a small RESET button on the camera or by using an Initialize option in the menu.

Older-model Cyber-shot cameras (prior to the year 2000) do not have a built-in rechargeable battery and do not have a RESET button or Initialize option in the menu. These cameras require a manual power reset.

IMPORTANT: To determine whether or not your camera has a RESET button or Initialize option, or for other model-specific information to complete any of the steps in this solution, refer to the operating instructions supplied with the product.

Follow the appropriate procedure below for your camera. Using an Initialize option in the menu
Since Cyber-shot cameras have different menu system layouts, refer to the instruction manual specific for your camera model.

Using a RESET button:
Locate the RESET button on the camera.
Use a pointed object (like a ballpoint pen) to press and hold the RESET button for 2-3 seconds.
After 2-3 seconds has elapsed, release the RESET button.

Performing a manual power reset:
Turn off the camera.
Remove the battery pack.
Remove the button-sized lithium battery.
Allow the camera to remain without power for 30 seconds.
Reinsert the button-sized lithium battery.
Reinsert the battery pack.
Turn on the camera.

If your camera is experiencing an issue and the issue is not resolved by performing the appropriate reset procedure above, then service may be required.

Hope this helps.

The coin size lithium battery is usually used to retain the settings .... e.g. date, time, preferences, etc.
So, it is not likely the cause of your flip LCD display not working

Have you tried pressing the set/ok button twice at the end of your entering the date and time?

How to reset a Cyber-shot® digital still camera back to original factory settings. Solution
Cyber-shot cameras nowadays have a built-in rechargeable battery for retaining time, date, and other settings. Since the built-in rechargeable battery is not removable, current Cyber-shot camera models can only be returned to the original factory settings by pressing a small RESET button on the camera or by using an Initialize option in the menu.
Older-model Cyber-shot cameras (prior to the year 2000) do not have a built-in rechargeable battery and do not have a RESETbutton or Initialize option in the menu. These cameras require a manual power reset.
IMPORTANT: To determine whether or not your camera has a RESET button or Initialize option, or for other model-specific information to complete any of the steps in this solution, refer to the operating instructions supplied with the product. Manuals are available online in the Manuals/Specs/Warranty section of the Sony® eSupport Web site.
Follow the appropriate procedure below for your camera.
Using an Initialize option in the menu
Since Cyber-shot cameras have different menu system layouts, refer to the instruction manual specific for your camera model.
Using a RESET button

1. Locate the RESET button on the camera.
2. Use a pointed object (like a ballpoint pen) to press and hold the RESET button for 2-3 seconds.
3. After 2-3 seconds has elapsed, release the RESET button.

Performing a manual power reset

1. Turn off the camera.
2. Remove the battery pack.
3. Remove the button-sized lithium battery.
4. Allow the camera to remain without power for 30 seconds.
5. Reinsert the button-sized lithium battery.
6. Reinsert the battery pack.
7. Turn on the camera.

If your camera is experiencing an issue and the issue is not resolved by performing the appropriate reset procedure above, then service may be required. The Sony® eService Web site at http://eservice.sony.com/ can assist you in obtaining service from a Sony Service Center or locating a Sony Authorized Servicer.

The date and time settings are displayed after turning on the camera. Solution
It is normal for the camera to lose time and date settings if the internal battery is left uncharged for an extended period of time; some cameras will default to the time-setting screen when turned on if this happens. Follow the steps below to resolve this issue.

1. Turn off the camera.
2. Do one of the following:
   • Insert a fully-charged battery pack into the camera.
   • If the camera is supplied with an AC power adapter, plug the adapter into a working electrical outlet and then connect it to the camera.
3. Allow the internal battery that retains the time and date information to charge for at least 90 minutes.
4. After enough time has elapsed to sufficiently charge the internal battery, turn on the camera.
5. Set the time and date.
6. Turn off the camera for 30 seconds.
7. Turn on the camera again.
8. Check to see if the date and time have been saved.

The troubleshooting steps listed above should resolve your issue. If you have completed all of the steps and the issue is not resolved, service may be required. The Sony® eService Web site at http://eservice.sony.com/ can assist you in obtaining service from a Sony Service Center or locating a Sony Authorized Servicer.

You need an NP-400 Li-ion lithium battery - I suspect ebay or Amazon can fix you right up.

My A720IS would not retain date/time from new (Nov 2007).
Worried about sending back for warranty, I thought I would check it out myself, I opened battery cover, removed AA batteries, removed
lithium date/time battery which exposed 2 finger type electrical contacts which I gently pulled out very slightly with a paper clip shaped like small hook, this gave enough tension to contact lithium battery and has worked ok since. Maybe this will work for you too.

The date time problem ist he internal battery[ A watch type button inside the camera body]
has worn out- replacing it will be a workshop job.
The other problem seems like wear and tear on the switch any repair will be costly.
Just live with[out]it- or buy a new camera