Power source

It’s amazing how many devices we have that use batteries, whether rechargeable or not.  

Mobile phone
Tablet
Toothbrush (of course)
Camera
Remote for TV (one for each)
Remote for set top box
Satellite navigation 
Laptop
Kitchen scales
Watches
Landline phone (3 in the system)
Lawn mower
Thermostat controls
Thermometer 
Pulse oximeter 
Blood pressure monitor 
Torches (various)
Vacuum cleaner (hand held)