Help! I’ve got haibike flyon 5.0 and the battery won’t charge and lights are not Turing on. So took battery apart and checked all the cells and all balanced and charge but still won’t turn on. As the bms is dead and just won’t work. If anyone knows where could get a replacement bms from would be much appreciated. Or has any idea of what’s up. As new battery about £800 bit out my budget.