This is the guide on how to replace a clock battery on a 4RE DVR. It is important to replace it when it runs low on power otherwise it can disrupt some of the functions of the 4RE.

This can be checked by pressing the menu button on the 4RE then going to the following place: Menu Button>Settings>Diagnose>Voltages. The 4RE should tell you if the clock battery is bad or good with a green or red color indicator for the text as shown below.

4RE DVR

Tools needed to replace the clock battery:

• 1/16 Allen Wrench  

• Key to remove/open the USB port

• Small pointed device (toothpick, small screwdriver)

The battery used is a 3 volt Lithium battery (CR1225) The battery is located beneath the USB port door.   

1. Turn OFF 4RE DVR system

2. Open the USB door and leave the RED USB port inside

3. Remove the (2) 1/16 Allen screws

4. Locate the depleted clock battery

5. Remove the clock battery with a small pointed object (small screw driver, toothpick etc)

6. Replace the clock battery with the positive (+) side up   (Positive side is slightly larger)

7. Put the black metal clock cover back on. The foam side covering the battery

8. Screw in the 1/16 Allen Screws

9. Turn on the DVR and correct the time and date (GPS enabled DVR’s will auto detect time)

10. Dispose of the consumed battery properly. Button cell batteries are generally toxic and should not be discarded in a regular trash but rather with other hazardous waste subject to your local government regulations. 

Additional Comments:
The batteries should be proactively replaced every 18 months or sooner if the vehicle is in a region with extreme heat or cold.

There is no need to disconnect the 4RE or vehicle battery