@ted3
The normal life expectancy of pacemaker or ICD/Pacemakers is 8-10 years. Of course the amount of time is really based on do you get shocks, how much pacemaker is having to pace and do you have exercise mode turned on, etc.

I am not sure why you are concerned that your battery life is 8.7 years. That is completely normal. I am on my 3rd ICD/Pacemaker and I have 3.4 months left of battery life on my present one. I have my pacemaker pacing my heart continoulsy at 70 bpm minute as if not because of medications it would be in 30s.

You mentioned your's pacing your at only 50% of the time. What is your pacing rate set at? Are you saying you heart only falls below what is your pacing is set at only 50% of the time. That is good not bad. Means you have good sinus rympthm and heart beating on it's own and most of the time at a rate your EPs says okay.

If your pacemaker is not pacing right and only works 50% of the time to pace you that is another matter. At the rate your pacemaker is set to because it will flow below that on it's own should be around 98% of the time. Of course if you are not falling below the set rate then is not going to pace you as you are at that rate on your own.

You are running 1-2 miles. That is great and should bring comfindence in your pacemaker and your doctors by being able to do so.

I posted the above on my now 20 years of experience on having a ICD/Pacemaker and on my 3rd one. I have been to pace clinic and EP doctors so many times with test and consulations, questions, fine tuning, changes I would not even be ablt to give you that number.

Going to your manufacturers web site for information is great. I alwasy recommed that when I post. You can put in your model and get great and thorough information on your device. I am not sure if Metronic gives you the ability to submit question to them like Boston Scientific but I do that all the time for specific feedback on something. Look into if they offer that.