Respuesta a "Why does my Roomba vacuum makes a ticking noise while its charging?"There is an issue with Roombas where the battery won't re-charge if the battery level gets too low. You have to buy a separate external battery charger, available on eBay, Amazon, etc. Google “external battery charger”. Once you charge it in that, it will work in the Roomba again. I’ve had to do that with mine a few times.