Probably a stupid question, but I'm too tired to go look it up now. Does temperature affect battery capacity or just it's efficiency and charging rate?@Tim Parkes have you looked at the capacity of your battery recently when fully charged? I don't use obdeleven very often but recently I looked and it was showing just under 30kWh when fully charged. As I had last over 32 kWh at some point early on I'm thinking the capacity is shrinking quite quickly and wondered how other people are finding things.
Edited to add...
Sod my inquisitiveness. A quick Google answered my question with this from Battery University
"The driving range of an electric vehicle between charges is calculated at ambient temperature. EV drivers are being made aware that frigid temperature reduces the available mileage. This loss is not only caused by heating the cabin electrically but by the inherent slowing of the battery’s electrochemical reaction, which reduces the capacity while cold."