Calcium batteries are in fact acid batteries. They differ to traditional lead acid batteries as their lead plate is impregnated with calcium. Calcium batteries offer both advantages and disadvantages in comparison to their traditional lead acid counterparts. They are more resistant to vibration, produce higher cold cranking amps (ccA), discharge much slower and are known to be less prone to sulphation. The disadvantages are that they are traditionally much more expensive than their lead acid counterparts, are much harder to charge once flat and are incompatible with some older vehicle electrical systems.