My CPO 2016 S60 Drive-E Platinum Insription with 60K miles shows the start/stop unavailable, and the reason is consistently electrical, most likely battery charge or temp. I have gone on 4 30 to 40 minute highway drives, and 4 20 minutes on the highway to the middle of town drives, and the condition persists. My dealer will likely provide a battery; OR I could just invest in a charger. But I have concerns about using a charger because the manual says to disconnect battery from car if charging. Do I need to do this? If I disconnect the battery long enough to try charging it for several hours, will it reset all my computer, radio presets, etc.?