LikeTheSandwich the way it works is that you daisy-chain the Alexa off the battery base. While the base is plugged in, the base delivers 15v and the Alexa works fine. As soon as you unplug the base from the mains, the voltage drops to almost nothing and the Alexa dies - this is what makes me think it’s the battery pack itself. In any case, since I’ve only just bought it I’m inclined to cut my losses and get my money back (though I’ll see if I can get a replacement first to see if the problem was a one-off)