We're big fans of the Philips Hue ecosystem in this house. All our bulbs and switches are Philips Hue. It's great, but the Philips Hue Dimmer Switch & Philips Hue Motion Sensor both us batteries that need replacing. This video shows how to replace them.
Philips Hue Dimmer Switch
Tools you need -
Battery : CR2450 - UK - https://amzn.to/3fnaLZL / USA - https://amzn.to/3kFTITG
Screwdriver : PH0 - UK - https://amzn.to/3pFszDV / USA - https://amzn.to/3lHhzU8
Philips Hue Motion Sensor
Tools you need -
Battery : AAA - UK - https://amzn.to/36O6wm0 / USA - https://amzn.to/2UDuzyj
Screwdriver : PH1 - UK - https://amzn.to/3pFszDV / USA - https://amzn.to/3lHhzU8