The original battery would appear to be on the way out in my 2014 1.2 3cyl Mirage.
After a 151 mile trip yesterday, the battery is measuring 12.4 volts today - approx 15 hrs later - and a hydrometer test indicates a specific gravity of 1.2 for all 6 cells.
The battery seems quite big for a 1.2 SI engine - 66AH and CCA 520 - but I assume this is because this vehicle has stop start.
During my trip, the battery was being charged approx 95% of the time.
I would assume that this is hurting my mpg though the average was a respectable 60.37 US # 72.5 IMP # 3.9 lit/100km.
Any advice on selecting a battery?
This is one candidate
https://www.ev-power.eu/LiFeYPO4-bat...0AH.html?cur=1