Start problem with Bandit600

today I wanted to drive home from school with my bike and what do I notice:the part jumps in and out.Now I know in any case how hard this part is ^^ someone has an idea why this is so? so I suspect that the battery is very weak,could that work? the starter still goes,but it just doesn’t start..it pops out of it every now and then! funny I also find that when I go in and pull the coupling, that I still don’t sc Is that normal? last night was pretty cold ass here and the poor baby had to stand the whole night outside. So if I hold down the star button longer, the lamp for the empty run will also become weaker and then and when does the speedometer start to hop a bit (motor doesn’t sprung up!) can someone help me?Is that only due to the battery? will charge them tomorrow.