You can replace the battery yourself. To do this, you need to find a video instruction on YouTube or look for instructions for a specific model of robotic vacuum cleaner. Using the video, you can calculate your strength and find out what tool, besides a screwdriver, will be necessary to carry out repair work. You can also rebuild the battery by updating the assembly elements. In this case, you must contact a service center or a battery sales workshop, having previously specified whether they do such assemblies (*this action is at your own discretion). There is a chance that the workshop will install elements of better capacity, and the vacuum cleaner will be able to work even longer than it did before.