I’m not aware of any first aid organisation in the UK that uses Samaritan PAD 300s, but you might potentially have one in the building where you work. Rather fetching blue and white job:

Shiny

Anyway, it turns out some of them have a fault where the battery constantly switches on and off when they’re not in use. I’d suggest that the ideal moment to discover that you’ve got a flat battery is not as you’re connecting to pads to someone’s chest.

Following serial numbers affected:

• 0400000501 to 0700032917
• 08A00035000 to 10A00070753
• 10C00200000 to 10C00210106

If you have an affected device, see here for what to do next.