is the Fiesta your daily driver? i'm thinking of doing this for my car before next winter but i've read it increases the chances of needing a jump if you go that route since the fiesta puts quite a load on the battery before engine start (all the things that turn on when you unlock the car)
I would've considered this as well, IF I did not have to use this car in our winter season at all.
I cannot
ever have it hooked up to a charger/tender where I am currently, unless I remove the battery every night, bring it inside, and charge it in the apartment.
So, I just got a full size, full power, (and yes, sadly even more 'full' weight than factory), Odyssey 96R-600 AGM.