For some weeks now, my Blue Smart Charger shows a strange behavior: it only charges the battery with 1A max, regardless of the setting (3A or 10A). I have tested several batteries. All with the same 1A limitation. A test with ctek 5A and the same batteries worked as expected (charge current 5A). Is there a built-in thermal protection or fuse in the Blue Smart Charger Box which might be broken? Or do you have any ideas, what else could cause this behavior?