Ah..just to explain...no assistance (as I understood it) was when the display read zero and the battery remained at a constant level, after that the options were for 30%, 60% or 100%. I mainly used 0%, then several times used 30%, 60% here and there and had 100% a couple of times - this zoomed me off up steep inclines at an impressive speed with little input from myself. After a 16 mile undulating and 60% track and woodland ride (the rest road) the battery had gone down to 87%...I was happy with that as I'm not very fit and recovering from a sports injury.