What he ^^^^ said When batteries were made here in NZ during the era of local assembly, they were big clunky things with lots of lead in the plates. But as the motor industry progressed the demand was for smaller, lighter and cheaper so that is what the battery manufacturers provided. Now that all batteries are imported from Asian countries and improved design, materials and manufacturing techniques are employed. The end result is a battery that is only just big enough to do the job for the warranty period if used in a well maintained and easy to start vehicle.... I fkn love marketing
I suspect that the AA has tapped into a lower cost source for their batteries to improve their margin. This may have the mildly embarrassing side effect of shorter battery life but the attitude is... never mind the quality... feel the width !! So if your vehicle is getting on in years and does not start as easily as it once did, you do a lot of short trips and use all the accessories thoughtfully provided by the manufacturer, you can look forward to buying a new battery from AA every three years.
This information is lifted directly from the AA website... Calcium batteries are the most commonly fitted battery; they also go by the name of ‘wet lead acid’ batteries. The basic ingredients are no different to the old style, but these batteries are more durable and have more starting power. They have a good shelf life and are maintenance free. But they require regular use, so when drained they must be recharged using a charger to bring them back to optimal health. Modern vehicle charging systems will struggle to recharge these fully when they’re drained.
What is not stated is that you need a special charger for calcium batteries, and that if your vehicle was not factory fitted with a calcium battery, the vehicle will most likely not be able to recharge the battery fully. Thus the battery will never be operating at optimum voltage and battery performance and service life will be reduced. It is a classic example of where a so called improvement (good shelf life and are maintenance free) that benefited sellers, was in fact a performance downgrade for buyers.
Cheers...