it seems like im being charged a fortune, i put it on emergency at 9am this morning unexpectedly and it gave me £5.00 i then got ready went out and came back at about 3pm today.I read the metre just now and its £4.66, ive got three lights on and the laptop im using needs to be plugged in as the battery is knackered.i had used nothing between going out and coming back, whats going on?