Best car batteries

Seeing as my cars believe there is no end to my money, the mossmobile was so dead today I had to unlock it with the key. The OEM Varta was dood soos 'n drol and I replaced it with a Willard. I do notice with the new battery that while the alternator is running the voltage is about 14.8V whereas with the old one it was 14.5V before it died.
 
So does anyone know where I can find silver calcium batteries? Battery centre wants to sell me their raylite enhanced flooded battery. Although there's nothing wrong with that I need silver calcium cause the car it'll be put in doesn't get driven much.
On their website they have silver calcium but in store only the above mentioned enhanced flooded, which on their website does NOT mention silver calcium.
 
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