How to replace battery in Merlin C943 C940 remote?

What type of battery do I need for the Merlin C943 C940 remote?

You'll need a CR2032 battery:

CR2032 battery

To replace the battery, follow the steps below:

Step 1: Use a coin, the visor clip or screwdriver blade to pry open the case, as shown (“Open” location is stamped on back.)

Merlin C945 remote battery replacement


Step 2: Insert batteries 10A20 (CR2032) x2 positive side up.

Merlin C945 remote battery replacement


For more details, please check the manual of Merlin C943 and C940 remotes which you can download here.

Would you like to add smartphone control to your gate or garage door?

Smart gate and garage door opener Remootio


You can try Remootio which allows you to control your electric gates and garage doors from your smartphone and smarthome hubs (such as Amazon Alexa, Google Home and Samsung SmartThings). 

Smart gate / garage door opener benefits compared to a traditional remote control:

  • No need to replace batteries. Just install it once and use it.
  • You can control your gate / garage door from anywhere in the world (over the internet)
  • 256 bit end-to-end encryption is more secure than rolling code solutions
  • You only need one Remootio unit and you can share keys with 20 people (no need to buy 20 remotes and replace 20 batteries from time to time)

Learn more about Remootio smart gate and garage door opener