Thanks for the info, ill get a Battery Bag if I take the 4th, just checked Easyjet T&C
Hand Luggage only!
Portable electronic devices (including medical devices) containing lithium metal or lithium ion cells or batteries such as watches, calculating machines, cameras, cellular phones, laptop computers, camcorders, etc., when carried by passengers or crew for personal use. Batteries must not exceed 2 g for lithium metal batteries and 100 Wh for lithium ion batteries.
All spare batteries, including lithium metal or lithium ion cells or batteries, for such portable electronic devices must be carried in carry-on baggage only. These batteries must be individually protected to prevent short circuit.
Portable electronic devices containing non-spillable batteries, must be 12 V or less and 100 Wh or less. A maximum of 2 spare batteries may be carried.