@bill54321 you have a rather unique pacemaker. I only had mine checked for battery level maybe 1 a year. They are usually only replaced every 5-7 years for battery level. I too was set at 70 but also I was not afib but Vintricular Tacricadia and if pacing did not get me out of an arrithmya them it had to shock me back into rhythm. My pacemaker had a built in defibrillator just like the ones doctors use in an er setting. So i dont think we had the same kind of issue. My shocks were deliberate and saved my life. But they always tried pacing first shocks were only if i basically was on deaths door. Have a Blessed day and may God bless! You.