You don't need spare batteries for this appliance as it has a fixed battery that is constantly recharged. Accessories such as wearing parts are also available to buy, but you get them when you buy the appliance new. Everything is supplied in duplicate and triplicate. This lasts for several years according to my experience, I'm not the first robot hoover but this one surpasses all the ones I've had. I am very satisfied. Mop roll makes all the difference. Most have mop pats.