Periodically the ego battery won’t charge when charged immediately after use. This occurs approx 1 out of 10 times. Pretty sure that the indicator on the battery goes ‘red’ and the charger indicators definitely don’t ‘move’ as they typically do during a charge. The batteries and charger are approximately 9 months old. I’ve considered that perhaps the battery needs to cool down before it is allowed to charge??? I say this because the battery will finally charge after a min or so as I remove it and reset it a few times hoping that it starts to charge. Any ideas? Thanks!