The term "battery change" is a misnomer. You'll be getting a new unit. When the battery voltage drops to a certain level, the pacemaker will go into an "end of life mode" (the battery, not the person). It's sort of a last ditch conservation mode until the battery can be replaced. What happens then is the pacemaker will fire to a preset pulse rate. It will no longer take into account what the user's heart is doing. This reported by some to be a very uncomfortable, miserable feeling. So the leads are unplugged, from the old one, and the new one is "installed". The procedure is very similar to when the original one was installed, minus the lead placement.
again, this is something you should speak with your doctor about. Giving you guidance will require knowledge of your full history. I doubt it's the battery, probably more related to you being on a beta blocker and that needs monitoring but I honestly don't know.
Things like "heart quit beating for a few seconds" can be any of a number of different things, all of which require a unique approach.
Call your doctor. Hope you find relief.
As a teenager had rhumatic fever damaged heart valve. In 2008 passed out in kitchen found out had irregular heart beat still. Put in hospital, heart quit beating for a few seconds, had pacemaker put in, suppose to have battery replaced next year but having problems with blood pressure dropping to low, want to know if it is because the battery needs to be changed, having other systems dizziness, of balance, pain in chest, whizzy, and slur words some. I take atenolol, plavix, pravastain.
Why are you paced? I'm assuming it's due to a slow heart rate but it could be something else. You should speak with your doctor about it.