It is definitely temperature related. After recharging tye temperature
was about 0c and it lost 23% overnight. Since then (3 days) it has only
lost an further 4%.
Thanks,IIt did get down to -2c last night so it may be that. I also have
a new broadband router so will try a few things 1st before I blame the
weather. Looks like that might be the issue though.