Do you have to recharge the batteries in a pacemaker?

No. The batteries in all current devices are lithium based and operate much like duracell (alkaline) batteries. They cannot and should not be recharged, and are in fact welded into the pacemaker device itself. Rechargeable devices are on the horizon but will not likely be available in the next 3-5 years.
No. You replace the generator. A simple procedure where an incision is made over the old pacmaker and a new one is placed . The wound is closed like the original. Usually done in cath lab , ep lab, or the or.Pts usually go home same day.