How to replace battery in garage / gate opener remote key fob?

Garage door opener remote battery replacements:

 

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  • How to replace battery in Genie 3 button remote
  • How to replace battery in Hormann HS 5 BiSecur
  • How to replace battery in marantec-m3-2312, m3-2314, m3-3313 remotes?
  • How to replace battery in Merlin C945 remote?
  • How to replace battery in Merlin C943 C940 remotes?

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