Zep
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The benefit of an AGM battery is that it can survive multiple deep cycles without loosing capacity. Thats why they are used on cars with stop start techcnology and cars with a lot of electrics such as heated seats, big audio installs, keyless entry etc.
I went through a few standard batteries on my Fiat Coupe 20v Turbo because of deep cycling losses. I only drive the car a couple of times a month and because it is parked outside I cant use a trickle charger. So while it is parked up the battery is continually drained by the alarm etc. Each time it is drained it looses some of its capacity to fully recharge, so eventually it dies
I ended up buying an Ultima Yellow Top AGM battery and it has completely solved the problem - even if nearly flat it re-charges back to full power every time. I would highly recommend one to anyone who only occasionaly uses their car and cant use a trickle charger.
Not all AGM batteries are like the Yellowtop. It has cylindrical cells rather than flat ones. It’s fully sealed.
Your battery is lasting better, not because it is AGM, but because it is higher quality.
A Maserati AGM battery is made by FIAMM. Ask anyone who works with batteries what they think about that.