At the Neurosurgery and Psychiatry consultation, eligible patients are informed about the present study. As soon as informed consent is obtained, the next time the battery of the non-rechargeable neurostimulator reaches its end‐of‐life and elective replacement is planned, a rechargeable neurostimulator and (if needed) the extension leads adaptors necessary to connect these neurostimulators with the existing extension leads will be implanted instead of a new non‐rechargeable neurostimulator.