the battery does not have a protection board so there is no loose conection there,
the only other battery i have goes in a battery holder, stripped out the wiring and wired in a batetry holder to test my only other 18650, as long as i dont bump it toards the spring it seems to stay on, i cant see any bamage to the outside of the battery or the conections, just ordered a battery with leads attached to see if i have a dodgy battery after all.