With all the things being taxed and banned it baffles me that you can still buy cheap AA and AAA single use batteries. You could buy a packet of 16 batteries or something for a couple of euro but they last no length. They're some of the most wasteful products around. You don't see the government doing ad campaigns encouraging people to buy a battery charger and some rechargeable batteries though.
Another thing that pisses me off is all the different type of lithium-ion phone and camera batteries. I've bought loads of digital cameras over the years and every one requires buying a new type of battery. Many of them use the same voltage batteries and I'm sure if they were standardised and made the same shape they'd work in different camera. It isn't enough to buy a new camera from Sony though, they want another €40 or €50 for a battery too and they don't want you using it in a Canon or Nikon, nor do Canon or Nikon want you using their batteries in a Sony camera.
Look at inkjet printers. Among some of the entry level models, it is cheaper to dump the whole thing in the bin after the inks run out because the replacement ink cartridges are the same price or more expenisive than buying a new printer.
The "right to repair" should be pushed for and in some quarters it is. "Lifetime" devices which are anything but does nothing for our carbon footprint. Companies changing parts every few months is designed to make them unrepairable. Cars are a good example of this. They are purposely designed to run well for a period of time, backed up by dealer only warranties for when they don't and then to be uneconomical to repair. This is madness, especially when we have had the tech since at least the 90's to make cars that could last far far longer and be easier to repair. Sticking batteries or fuel cells into them will do nothing for this wasteful product cycle. It may even make things worse as marketing will convince people they need the latest Car 2.1 and they could become more like IT devices to be replaced entirely every few years.