Se pueden usar sin batería y con cable, pero tendrás que esperar a que se acabe. Honestly, dont even think. Unfortunately one the the cables was broken on arrival. So long as you care for them properly and dont yank on the cord, twist it around your fingers, etc, they should last you a long time. These were more like the cheap $1 flip flops from Old Navy. That model was about 5 years old and couldnt still get it today. An introduction such as this could be deemed necessary as a lead-in to the main topic at hand, telephone books. I bought an xl and immediately could put it on the 2nd line of hooks. so much more comfortable and i won’t wear them without these! Easy blow up within minutes.