If it originally came with a calcium battery from the factory, which I'm 99.9% sure it did, then it MUST only have a calcium one fitted, as said the charge rate is often much higher, though it doesn't have to be, and they will work perfectly on cars where a std lead/acid battery was used.
Lead acid are pegged at 14.4V, otherwise plates inside overheat and damage occurs, calcium can charge up to around 16.5V level without any harm, and give better performance.
I've seen a citroen bx charge it's battery at 19V, that was frightening, the battery was actually smoking heavily when they brought the car in for a battery check, they were told not to use the car and leave it overnight for new alt/battery, they drove away!!
tabetha